Update changelog

Author: TheMrMilchmann

plugin-gradle/CHANGES.md

@@ -3,6 +3,8 @@
 We adhere to the [keepachangelog](https://keepachangelog.com/en/1.0.0/) format (starting after version `3.27.0`).
 
 ## [Unreleased]
+### Fixed
+* Make `SpotlessDiagnoseTask` compatible with the configuration cache` ([#2504](https://github.com/diffplug/spotless/pull/2504))
 
 ## [7.0.4] - 2025-05-27
 ### Fixed