Update RELEASES.md

Co-authored-by: Travis Cross <[email protected]>

Author: Mark-Simulacrum

RELEASES.md

@@ -15,6 +15,7 @@ Language
 - [Restrict promotion of `const fn` calls.](https://github.com/rust-lang/rust/pull/121557/)
 - [Warn against refining impls of crate-private traits with `refining_impl_trait` lint.](https://github.com/rust-lang/rust/pull/121720/)
 - [Stabilize associated type bounds (RFC 2289).](https://github.com/rust-lang/rust/pull/122055/)
+- [Stabilize importing `main` from other modules or crates.](https://github.com/rust-lang/rust/pull/122060/)
 
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