Update CHANGELOG

Author: mpkorstanje

CHANGELOG.md

@@ -10,6 +10,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Changed
+- [JUnit Platform Engine] Use JUnit Platform 1.13.1 (JUnit Jupiter 5.13.1)
 
 ## [7.23.0] - 2025-05-29
 ### Added