Update CHANGES.md

Chenzo1001 · Chenzo1001 · commit f03997a3f856 · 2025-04-08T11:13:33.000+08:00
diff --git a/CHANGES.md b/CHANGES.md
@@ -72,7 +72,7 @@
 
 ## Breaking Changes
 
-* X behavior was changed ([#X](https://github.com/apache/beam/issues/X)).
+* Python: Added JupyterLab 4.x extension compatibility for enhanced notebook integration ([#34495](https://github.com/apache/beam/pull/34495)).
 
 ## Deprecations
 
