Feature min_type_alias_impl_trait renamed to type_alias_impl_trait

As of nightly-2021-07-29:

    error[E0557]: feature has been removed
     --> tests/test.rs:3:33
      |
    3 |     feature(min_specialization, min_type_alias_impl_trait)
      |                                 ^^^^^^^^^^^^^^^^^^^^^^^^^ feature has been removed
      |
      = note: removed in favor of full type_alias_impl_trait

    error[E0658]: `impl Trait` in type aliases is unstable
        --> tests/test.rs:1299:22
         |
    1299 |         type Assoc = impl Sized;
         |                      ^^^^^^^^^^
         |
         = note: see issue #63063 <rust-lang/rust#63063> for more information
         = help: add `#![feature(type_alias_impl_trait)]` to the crate attributes to enable

tests/test.rs

@@ -1,6 +1,6 @@
 #![cfg_attr(
     async_trait_nightly_testing,
-    feature(min_specialization, min_type_alias_impl_trait)
+    feature(min_specialization, type_alias_impl_trait)
 )]
 #![allow(
     clippy::let_underscore_drop,