Add changelog note

Author: henrymercer

CHANGELOG.md

@@ -4,6 +4,7 @@ See the [releases page](https://github.com/github/codeql-action/releases) for th
 
 ## [UNRELEASED]
 
+- Bump minimum CodeQL bundle version to 2.16.6. [#2912](https://github.com/github/codeql-action/pull/2912)
 - The CodeQL Action no longer includes its own copy of the extractor for the `actions` language, which is currently in public preview.
   The `actions` extractor has been included in the CodeQL CLI since v2.20.6. If your workflow has enabled the `actions` language _and_ you have pinned
   your `tools:` property to a specific version of the CodeQL CLI earlier than v2.20.6, you will need to update to at least CodeQL v2.20.6 or disable