adapted changelog

Author: maltesander

CHANGELOG.md

@@ -8,7 +8,13 @@ All notable changes to this project will be documented in this file.
 
 - Add `ZOOCFGDIR` env var to `/stackable/rwconfig` to improve shell script usage like `zkCleanup.sh` ([#988]).
 
+### Changed
+
+- Adapted to [ZOOKEEPER-4276](https://issues.apache.org/jira/browse/ZOOKEEPER-4276). Removed `clientPort` and `secureClientPort` as well as 
+  `client.portUnification` from the `zoo.cfg` config. Secure ZooKeeper clusters now do not accept plain text connections anymore. ([#996]).
+
 [#988]: https://github.com/stackabletech/zookeeper-operator/pull/988
+[#996]: https://github.com/stackabletech/zookeeper-operator/pull/996
 
 ## [25.11.0] - 2025-11-07