Update CHANGELOG.md

Author: JenniferDUnity

com.unity.postprocessing/CHANGELOG.md

@@ -4,10 +4,11 @@ All notable changes to this package will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
-## [3.5.3] - 2026-03-12
+## [3.5.4] - 2026-03-12
 
 ### Fixed
 - Documentation updates
+- Compilation fixes with Core-CLR
 
 ## [3.5.2] - 2025-12-17