Update release notes to include CVE-2022-21658

Author: pietroalbini

RELEASES.md

@@ -1,11 +1,13 @@
 Version 1.58.1 (2022-01-19)
 ===========================
 
+* Fix race condition in `std::fs::remove_dir_all` ([CVE-2022-21658])
 * [Handle captured arguments in the `useless_format` Clippy lint][clippy/8295]
 * [Move `non_send_fields_in_send_ty` Clippy lint to nursery][clippy/8075]
 * [Fix wrong error message displayed when some imports are missing][91254]
 * [Fix rustfmt not formatting generated files from stdin][92912]
 
+[CVE-2022-21658]: https://www.cve.org/CVERecord?id=CVE-2022-21658]
 [91254]: https://github.com/rust-lang/rust/pull/91254
 [92912]: https://github.com/rust-lang/rust/pull/92912
 [clippy/8075]: https://github.com/rust-lang/rust-clippy/pull/8075