Document workflow YAML anchors refactoring in CHANGELOG

Co-authored-by: SimplyDanny <16365760+SimplyDanny@users.noreply.github.com>

Author: Copilot

CHANGELOG.md

@@ -12,7 +12,9 @@
 
 ### Enhancements
 
-* None.
+* Refactor GitHub workflow files to use YAML anchors for common patterns,
+  reducing duplication and improving maintainability.  
+  [SimplyDanny](https://github.com/SimplyDanny)
 
 ### Bug Fixes