Update changelog for version 8.4.1

Author: Sephster

CHANGELOG.md

@@ -5,6 +5,8 @@ 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).
 
 ## [Unreleased]
+
+## [8.4.1] - released 2023-03-22
 ### Fixed
 - Fix deprecation notices for PHP 8.x (PR #1329)
 
@@ -578,7 +580,8 @@ Version 5 is a complete code rewrite.
 
 - First major release
 
-[Unreleased]: https://github.com/thephpleague/oauth2-server/compare/8.4.0...HEAD
+[Unreleased]: https://github.com/thephpleague/oauth2-server/compare/8.4.1...HEAD
+[8.4.1]: https://github.com/thephpleague/oauth2-server/compare/8.4.0...8.4.1
 [8.4.0]: https://github.com/thephpleague/oauth2-server/compare/8.3.6...8.4.0
 [8.3.6]: https://github.com/thephpleague/oauth2-server/compare/8.3.5...8.3.6
 [8.3.5]: https://github.com/thephpleague/oauth2-server/compare/8.3.4...8.3.5