Update changelog for v2.22.2

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]
+## 2.22.2 - 12 Oct 2023
 
 - Update default CodeQL bundle version to 2.15.0. [#1938](https://github.com/github/codeql-action/pull/1938)
 - Improve the log output when an error occurs in an invocation of the CodeQL CLI. [#1927](https://github.com/github/codeql-action/pull/1927)