Update changelog for v3.29.1

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]
+## 3.29.1 - 27 Jun 2025
 
 - Fix bug in PR analysis where user-provided `include` query filter fails to exclude non-included queries. [#2938](https://github.com/github/codeql-action/pull/2938)
 - Update default CodeQL bundle version to 2.22.1. [#2950](https://github.com/github/codeql-action/pull/2950)