Update RELEASES.md

Co-authored-by: Jubilee <[email protected]>
rust-lang · Jul 14, 2024 · b44930b · b44930b
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diff --git a/RELEASES.md b/RELEASES.md
@@ -142,6 +142,7 @@ Compatibility Notes
 - [Make `where_clause_object_safety` lint a regular object safety violation](https://github.com/rust-lang/rust/pull/125380/)
 - [Turn `proc_macro_back_compat` lint into a hard error.](https://github.com/rust-lang/rust/pull/125596/)
 - [Detect unused structs even when implementing private traits](https://github.com/rust-lang/rust/pull/122382/)
+- [`std::sync::ReentrantLockGuard<T>` is no longer `Sync` if `T: !Sync`](https://github.com/rust-lang/rust/pull/125527) which means [`std::io::StdoutLock` and `std::io::StderrLock` are no longer Sync](https://github.com/rust-lang/rust/issues/127340)
 
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