Update changelog and version after v2.22.6

Author: github-actions[bot]

Diff for: CHANGELOG.md

@@ -2,6 +2,10 @@
 
 See the [releases page](https://github.com/github/codeql-action/releases) for the relevant changes to the CodeQL CLI and language packs.
 
+## [UNRELEASED]
+
+No user facing changes.
+
 ## 2.22.6 - 14 Nov 2023
 
 - Customers running Python analysis on macOS using version 2.14.6 or earlier of the CodeQL CLI should upgrade to CodeQL CLI version 2.15.0 or later. If you do not wish to upgrade the CodeQL CLI, ensure that you are using Python version 3.11 or earlier, as CodeQL version 2.14.6 and earlier do not support Python 3.12. You can achieve this by adding a [`setup-python`](https://github.com/actions/setup-python) step to your code scanning workflow before the step that invokes `github/codeql-action/init`.

Diff for: package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "codeql",
-  "version": "2.22.6",
+  "version": "2.22.7",
   "private": true,
   "description": "CodeQL action",
   "scripts": {