Update changelog for v2.22.7

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]
+## 2.22.7 - 16 Nov 2023
 
 - Add a deprecation warning for customers using CodeQL version 2.11.5 and earlier. These versions of CodeQL were discontinued on 8 November 2023 alongside GitHub Enterprise Server 3.7, and will be unsupported by CodeQL Action v2.23.0 and later. [#1993](https://github.com/github/codeql-action/pull/1993)
   - If you are using one of these versions, please update to CodeQL CLI version 2.11.6 or later. For instance, if you have specified a custom version of the CLI using the 'tools' input to the 'init' Action, you can remove this input to use the default version.