chore: Update changelog

Author: NickLarsenNZ

CHANGELOG.md

@@ -7,13 +7,15 @@ All notable changes to this project will be documented in this file.
 ### Added
 
 - Add experimental support for Spark 4 ([#589])
+- Helm: Allow Pod `priorityClassName` to be configured ([#608]).
 
 ### Fixed
 
 - SparkConnectServer: The `imagePullSecret` is now correctly passed to Spark executor pods ([#603]).
 
 [#589]: https://github.com/stackabletech/spark-k8s-operator/pull/589
 [#603]: https://github.com/stackabletech/spark-k8s-operator/pull/603
+[#608]: https://github.com/stackabletech/spark-k8s-operator/pull/608
 
 ## [25.7.0] - 2025-07-23