Mark std::os::wasi::io::AsFd etc. as stable.

io_safety was stabilized in Rust 1.63, so mark the io_safety exports in
`std::os::wasi::io` as stable.

Fixes rust-lang#103306.

library/std/src/os/wasi/io/fd.rs

@@ -1,9 +1,10 @@
 //! Owned and borrowed file descriptors.
 
-#![unstable(feature = "wasi_ext", issue = "71213")]
+#![stable(feature = "io_safety_wasi", since = "1.65.0")]
 
 // Tests for this module
 #[cfg(test)]
 mod tests;
 
+#[stable(feature = "io_safety_wasi", since = "1.65.0")]
 pub use crate::os::fd::owned::*;

library/std/src/os/wasi/io/mod.rs

@@ -1,12 +1,12 @@
 //! WASI-specific extensions to general I/O primitives.
 
 #![deny(unsafe_op_in_unsafe_fn)]
-#![unstable(feature = "wasi_ext", issue = "71213")]
+#![stable(feature = "io_safety_wasi", since = "1.65.0")]
 
 mod fd;
 mod raw;
 
-#[unstable(feature = "wasi_ext", issue = "71213")]
+#[stable(feature = "io_safety_wasi", since = "1.65.0")]
 pub use fd::*;
-#[unstable(feature = "wasi_ext", issue = "71213")]
+#[stable(feature = "io_safety_wasi", since = "1.65.0")]
 pub use raw::*;

library/std/src/os/wasi/io/raw.rs

@@ -1,20 +1,6 @@
 //! WASI-specific extensions to general I/O primitives.
 
-#![unstable(feature = "wasi_ext", issue = "71213")]
+#![stable(feature = "io_safety_wasi", since = "1.65.0")]
 
-// NOTE: despite the fact that this module is unstable,
-// stable Rust had the capability to access the stable
-// re-exported items from os::fd::raw through this
-// unstable module.
-// In PR #95956 the stability checker was changed to check
-// all path segments of an item rather than just the last,
-// which caused the aforementioned stable usage to regress
-// (see issue #99502).
-// As a result, the items in os::fd::raw were given the
-// rustc_allowed_through_unstable_modules attribute.
-// No regression tests were added to ensure this property,
-// as CI is not configured to test wasm32-wasi.
-// If this module is stabilized,
-// you may want to remove those attributes
-// (assuming no other unstable modules need them).
+#[stable(feature = "io_safety_wasi", since = "1.65.0")]
 pub use crate::os::fd::raw::*;