Replace unmaintained actions-rs/toolchain action in CI workflows

[striezel]

Basically all of the actions-rs/* actions are unmaintained. See actions-rs/toolchain#216 for more information. Due to their age they generate several warnings in CI runs, for example in https://github.com/RustCrypto/RSA/actions/runs/4347839802:

Node.js 12 actions are deprecated. Please update the following actions to use Node.js 16: actions-rs/toolchain@v1. For more information see: https://github.blog/changelog/2022-09-22-github-actions-all-actions-will-begin-running-on-node16-instead-of-node12/.

To get rid of some of those warnings the occurrences of actions-rs/toolchain are replaced by dtolnay/rust-toolchain.

(Note: There is no occurrence of actions-rs/cargo in this workflow, so it does not need to be replaced.)

[striezel]

Internal compiler error strikes again (https://github.com/RustCrypto/RSA/actions/runs/4442743189/jobs/7799277268):

error: internal compiler error: /rustc/ab654863c3d50482f260cf862647f1fe0ff5e010/compiler/rustc_infer/src/infer/outlives/env.rs:145:26: add_outlives_bounds: unexpected regions

thread 'rustc' panicked at 'Box<dyn Any>', /rustc/ab654863c3d50482f260cf862647f1fe0ff5e010/compiler/rustc_errors/src/lib.rs:1644:9
stack backtrace:
   0:     0x7f1d40b7d50a - std::backtrace_rs::backtrace::libunwind::trace::hca5b94e57c77ccf5
                               at /rustc/ab654863c3d50482f260cf862647f1fe0ff5e010/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7f1d40b7d50a - std::backtrace_rs::backtrace::trace_unsynchronized::h5b5fce74d82f8778
                               at /rustc/ab654863c3d50482f260cf862647f1fe0ff5e010/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f1d40b7d50a - std::sys_common::backtrace::_print_fmt::ha47e7aaa1d2225ec
                               at /rustc/ab654863c3d50482f260cf862647f1fe0ff5e010/library/std/src/sys_common/backtrace.rs:65:5
   3:     0x7f1d40b7d50a - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::ha1aaba92be89501b
                               at /rustc/ab654863c3d50482f260cf862647f1fe0ff5e010/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f1d40be0b3e - core::fmt::write::h750a8e721825859f
                               at /rustc/ab654863c3d50482f260cf862647f1fe0ff5e010/library/core/src/fmt/mod.rs:1232:17
   5:     0x7f1d40b70375 - std::io::Write::write_fmt::hbf6015e32697f7ba
                               at /rustc/ab654863c3d50482f260cf862647f1fe0ff5e010/library/std/src/io/mod.rs:1684:15
   6:     0x7f1d40b7d2d5 - std::sys_common::backtrace::_print::h301c6b6cac7c0a3a
                               at /rustc/ab654863c3d50482f260cf862647f1fe0ff5e010/library/std/src/sys_common/backtrace.rs:47:5
   7:     0x7f1d40b7d2d5 - std::sys_common::backtrace::print::h7f921f37b0542aab
                               at /rustc/ab654863c3d50482f260cf862647f1fe0ff5e010/library/std/src/sys_common/backtrace.rs:34:9
   8:     0x7f1d40b8004f - std::panicking::default_hook::{{closure}}::ha1e8e5c596b5be71
                               at /rustc/ab654863c3d50482f260cf862647f1fe0ff5e010/library/std/src/panicking.rs:271:22
   9:     0x7f1d40b7fd8b - std::panicking::default_hook::hb0497d64ba7aeb9b
                               at /rustc/ab654863c3d50482f260cf862647f1fe0ff5e010/library/std/src/panicking.rs:290:9
  10:     0x7f1d43e7b475 - rustc_driver_impl[190cb2184ae08abb]::DEFAULT_HOOK::{closure#0}::{closure#0}
  11:     0x7f1d40b8088d - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h5fe0c368b54c8ed7
                               at /rustc/ab654863c3d50482f260cf862647f1fe0ff5e010/library/alloc/src/boxed.rs:2002:9
  12:     0x7f1d40b8088d - std::panicking::rust_panic_with_hook::hde905c542c1ea61a
                               at /rustc/ab654863c3d50482f260cf862647f1fe0ff5e010/library/std/src/panicking.rs:696:13
  13:     0x7f1d443e0161 - std[75e4c6f671155ce4]::panicking::begin_panic::<rustc_errors[bdf389fe3f70d25b]::ExplicitBug>::{closure#0}
  14:     0x7f1d443db876 - std[75e4c6f671155ce4]::sys_common::backtrace::__rust_end_short_backtrace::<std[75e4c6f671155ce4]::panicking::begin_panic<rustc_errors[bdf389fe3f70d25b]::ExplicitBug>::{closure#0}, !>
  15:     0x7f1d443d86e6 - std[75e4c6f671155ce4]::panicking::begin_panic::<rustc_errors[bdf389fe3f70d25b]::ExplicitBug>
  16:     0x7f1d4442d606 - std[75e4c6f671155ce4]::panic::panic_any::<rustc_errors[bdf389fe3f70d25b]::ExplicitBug>
  17:     0x7f1d44429e26 - <rustc_errors[bdf389fe3f70d25b]::HandlerInner>::bug::<&alloc[dd66e831cb8c4684]::string::String>
  18:     0x7f1d44429af0 - <rustc_errors[bdf389fe3f70d25b]::Handler>::bug::<&alloc[dd66e831cb8c4684]::string::String>
  19:     0x7f1d44415f9b - rustc_middle[d8dcb3e1f9b6a1d3]::util::bug::opt_span_bug_fmt::<rustc_span[e39f9d1da20fb520]::span_encoding::Span>::{closure#0}
  20:     0x7f1d444148ea - rustc_middle[d8dcb3e1f9b6a1d3]::ty::context::tls::with_opt::<rustc_middle[d8dcb3e1f9b6a1d3]::util::bug::opt_span_bug_fmt<rustc_span[e39f9d1da20fb520]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  21:     0x7f1d444148b6 - rustc_middle[d8dcb3e1f9b6a1d3]::ty::context::tls::with_context_opt::<rustc_middle[d8dcb3e1f9b6a1d3]::ty::context::tls::with_opt<rustc_middle[d8dcb3e1f9b6a1d3]::util::bug::opt_span_bug_fmt<rustc_span[e39f9d1da20fb520]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  22:     0x7f1d44415ee6 - rustc_middle[d8dcb3e1f9b6a1d3]::util::bug::opt_span_bug_fmt::<rustc_span[e39f9d1da20fb520]::span_encoding::Span>
  23:     0x7f1d424d94b3 - rustc_middle[d8dcb3e1f9b6a1d3]::util::bug::bug_fmt
  24:     0x7f1d42696b45 - <rustc_infer[4cb97a789990ae8c]::infer::outlives::env::OutlivesEnvironment>::with_bounds::<core[86d79cd3dd753e85]::iter::adapters::flatten::Flatten<core[86d79cd3dd753e85]::iter::adapters::map::Map<indexmap[6bbb46ee84024ff5]::set::IntoIter<rustc_middle[d8dcb3e1f9b6a1d3]::ty::Ty>, <rustc_infer[4cb97a789990ae8c]::infer::InferCtxt as rustc_trait_selection[834a42ea12cf8990]::traits::outlives_bounds::InferCtxtExt>::implied_bounds_tys::{closure#0}>>>
  25:     0x7f1d42993580 - rustc_hir_analysis[60e36e2803dc18bc]::check::compare_impl_item::compare_method_predicate_entailment
  26:     0x7f1d4298d6bb - rustc_hir_analysis[60e36e2803dc18bc]::check::compare_impl_item::compare_impl_method
  27:     0x7f1d42985f1c - rustc_hir_analysis[60e36e2803dc18bc]::check::check::check_impl_items_against_trait
  28:     0x7f1d4297d2b8 - rustc_hir_analysis[60e36e2803dc18bc]::check::check::check_mod_item_types
  29:     0x7f1d434ae2be - rustc_query_system[1a66d6a5882ef44d]::query::plumbing::try_execute_query::<rustc_query_impl[9c3c364151da071f]::queries::check_mod_item_types, rustc_query_impl[9c3c364151da071f]::plumbing::QueryCtxt>
  30:     0x7f1d434ade43 - <rustc_query_impl[9c3c364151da071f]::Queries as rustc_middle[d8dcb3e1f9b6a1d3]::ty::query::QueryEngine>::check_mod_item_types
  31:     0x7f1d4351f27c - <rustc_middle[d8dcb3e1f9b6a1d3]::hir::map::Map>::for_each_module::<rustc_hir_analysis[60e36e2803dc18bc]::check_crate::{closure#6}::{closure#0}>
  32:     0x7f1d420846b8 - rustc_hir_analysis[60e36e2803dc18bc]::check_crate
  33:     0x7f1d4207bd25 - rustc_interface[c60781b202b529bb]::passes::analysis
  34:     0x7f1d43689b9c - rustc_query_system[1a66d6a5882ef44d]::query::plumbing::try_execute_query::<rustc_query_impl[9c3c364151da071f]::queries::analysis, rustc_query_impl[9c3c364151da071f]::plumbing::QueryCtxt>
  35:     0x7f1d43689890 - <rustc_query_impl[9c3c364151da071f]::Queries as rustc_middle[d8dcb3e1f9b6a1d3]::ty::query::QueryEngine>::analysis
  36:     0x7f1d434b3899 - <rustc_middle[d8dcb3e1f9b6a1d3]::ty::context::GlobalCtxt>::enter::<rustc_driver_impl[190cb2184ae08abb]::run_compiler::{closure#1}::{closure#2}::{closure#4}, core[86d79cd3dd753e85]::result::Result<(), rustc_span[e39f9d1da20fb520]::ErrorGuaranteed>>
  37:     0x7f1d4303fdc8 - rustc_span[e39f9d1da20fb520]::with_source_map::<core[86d79cd3dd753e85]::result::Result<(), rustc_span[e39f9d1da20fb520]::ErrorGuaranteed>, rustc_interface[c60781b202b529bb]::interface::run_compiler<core[86d79cd3dd753e85]::result::Result<(), rustc_span[e39f9d1da20fb520]::ErrorGuaranteed>, rustc_driver_impl[190cb2184ae08abb]::run_compiler::{closure#1}>::{closure#0}::{closure#0}>
  38:     0x7f1d430378e0 - <scoped_tls[3baa4ec3dd04ff72]::ScopedKey<rustc_span[e39f9d1da20fb520]::SessionGlobals>>::set::<rustc_interface[c60781b202b529bb]::interface::run_compiler<core[86d79cd3dd753e85]::result::Result<(), rustc_span[e39f9d1da20fb520]::ErrorGuaranteed>, rustc_driver_impl[190cb2184ae08abb]::run_compiler::{closure#1}>::{closure#0}, core[86d79cd3dd753e85]::result::Result<(), rustc_span[e39f9d1da20fb520]::ErrorGuaranteed>>
  39:     0x7f1d43036fc2 - std[75e4c6f671155ce4]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[c60781b202b529bb]::util::run_in_thread_pool_with_globals<rustc_interface[c60781b202b529bb]::interface::run_compiler<core[86d79cd3dd753e85]::result::Result<(), rustc_span[e39f9d1da20fb520]::ErrorGuaranteed>, rustc_driver_impl[190cb2184ae08abb]::run_compiler::{closure#1}>::{closure#0}, core[86d79cd3dd753e85]::result::Result<(), rustc_span[e39f9d1da20fb520]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[86d79cd3dd753e85]::result::Result<(), rustc_span[e39f9d1da20fb520]::ErrorGuaranteed>>
  40:     0x7f1d43036d6a - <<std[75e4c6f671155ce4]::thread::Builder>::spawn_unchecked_<rustc_interface[c60781b202b529bb]::util::run_in_thread_pool_with_globals<rustc_interface[c60781b202b529bb]::interface::run_compiler<core[86d79cd3dd753e85]::result::Result<(), rustc_span[e39f9d1da20fb520]::ErrorGuaranteed>, rustc_driver_impl[190cb2184ae08abb]::run_compiler::{closure#1}>::{closure#0}, core[86d79cd3dd753e85]::result::Result<(), rustc_span[e39f9d1da20fb520]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[86d79cd3dd753e85]::result::Result<(), rustc_span[e39f9d1da20fb520]::ErrorGuaranteed>>::{closure#1} as core[86d79cd3dd753e85]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  41:     0x7f1d40b8a783 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h3341c80cf784afb0
                               at /rustc/ab654863c3d50482f260cf862647f1fe0ff5e010/library/alloc/src/boxed.rs:1988:9
  42:     0x7f1d40b8a783 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h6a4397435c8c4587
                               at /rustc/ab654863c3d50482f260cf862647f1fe0ff5e010/library/alloc/src/boxed.rs:1988:9
  43:     0x7f1d40b8a783 - std::sys::unix::thread::Thread::new::thread_start::h4d87276efd9893f6
                               at /rustc/ab654863c3d50482f260cf862647f1fe0ff5e010/library/std/src/sys/unix/thread.rs:108:17
  44:     0x7f1d408cdb43 - <unknown>
  45:     0x7f1d4095fa00 - <unknown>
  46:                0x0 - <unknown>

note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md

note: rustc 1.70.0-nightly (ab654863c 2023-03-15) running on x86_64-unknown-linux-gnu

note: compiler flags: --crate-type lib -C opt-level=3 -C embed-bitcode=no

note: some of the compiler flags provided by cargo are hidden

query stack during panic:
#0 [check_mod_item_types] checking item types in module `spki`
#1 [analysis] running analysis passes on this crate
end of query stack
error: could not compile `spki` (lib)
warning: build failed, waiting for other jobs to finish...
Error: Process completed with exit code 101.

To me it looks like this is an instance of rust-lang/rust#109199, too.

[tarcieri]

@newpavlov it'd probably be good if the minimal-versions action only used nightly to do -Z minimal-versions and used e.g. stable to actually run the tests afterward, so we don't run into ICE issues like this due to to upstream nightly changes

[striezel]

As far as I understand, this particular ICE is fixed in newer versions of rustc nightly, so just re-triggering the jobs that are using nightly might be enough to make the whole workflow pass again.

(It obviously does not help with future ICEs, though.)