update changelog with latest changes

Author: Release bot

CHANGELOG.md

@@ -7,6 +7,7 @@
 ## Documentation
 
 * **idempotency:** fix, improve, and increase visibility for batch integration ([#1776](https://github.com/awslabs/aws-lambda-powertools-python/issues/1776))
+* **validation:** fix broken link; enrich built-in jmespath links ([#1777](https://github.com/awslabs/aws-lambda-powertools-python/issues/1777))
 
 ## Maintenance