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.
+- Fix an issue downloading the CodeQL Bundle from a GitHub Enterprise Server instance where the CodeQL Bundle has been synced to the instance using the [CodeQL Action sync tool](https://github.com/github/codeql-action-sync-tool) and the Actions runner does not have Zstandard installed. [#2710](https://github.com/github/codeql-action/pull/2710)
 
 ## 3.28.2 - 21 Jan 2025