Rollup merge of rust-lang#148603 - pietroalbini:ea-1.91.1-relnotes, r=pietroalbini

Backport 1.91.1 relnotes to main

Backport of the release notes from rust-lang#148593 to the main branch. This should land before Monday so that the automation creates the GitHub release.

Author: jhpratt

RELEASES.md

@@ -1,3 +1,11 @@
+Version 1.91.1 (2025-11-10)
+===========================
+
+<a id="1.91.1"></a>
+
+- [Enable file locking support in illumos](https://github.com/rust-lang/rust/pull/148322). This fixes Cargo not locking the build directory on illumos.
+- [Fix `wasm_import_module` attribute cross-crate](https://github.com/rust-lang/rust/pull/148363). This fixes linker errors on WASM targets.
+
 Version 1.91.0 (2025-10-30)
 ==========================