Add changelog note

Author: henrymercer

CHANGELOG.md

@@ -4,7 +4,7 @@ See the [releases page](https://github.com/github/codeql-action/releases) for th
 
 ## [UNRELEASED]
 
-No user facing changes.
+- Provide an authentication token when downloading the CodeQL Bundle from the API of a GitHub Enterprise Server instance. [#1945](https://github.com/github/codeql-action/pull/1945)
 
 ## 2.22.2 - 12 Oct 2023