Update changelog

Author: RasmusWL

CHANGELOG.md

@@ -6,7 +6,7 @@ Note that the only difference between `v2` and `v3` of the CodeQL Action is the
 
 ## [UNRELEASED]
 
-No user facing changes.
+- On GHES, CodeQL Python analysis will no longer install dependencies, like already implemented on github.com. See [release notes for 3.23.0](#3230---08-jan-2024) for more details. [#2106](https://github.com/github/codeql-action/pull/2106)
 
 ## 3.23.2 - 26 Jan 2024