Update changelog for v2.22.1

Author: github-actions[bot]

CHANGELOG.md

@@ -2,7 +2,7 @@
 
 See the [releases page](https://github.com/github/codeql-action/releases) for the relevant changes to the CodeQL CLI and language packs.
 
-## [UNRELEASED]
+## 2.22.1 - 09 Oct 2023
 
 - Add a workaround for Python 3.12, which is not supported in CodeQL CLI version 2.14.6 or earlier. If you are running an analysis on Windows and using Python 3.12 or later, the CodeQL Action will switch to running Python 3.11. In this case, if Python 3.11 is not found, then the workflow will fail. [#1928](https://github.com/github/codeql-action/pull/1928)