Merge branch '11.5' into 11.6

Author: GrahamCampbell

CHANGELOG.md

@@ -11,7 +11,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 [11.6.0]: https://github.com/GitLabPHP/Client/compare/11.5.0...11.6.0
 
-## [11.5.0] - UPCOMING
+## [11.5.0] - 2021-12-26
 
 * Added support for filtering environments by state
 * Added support for approval rules endpoints
@@ -23,6 +23,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * Added support for removing protected branches
 * Added support for `psr/cache:^2.0`
 * Added support for `symfony/options-resolver:^6.0`
+* Added support for PHP 8.1
 
 [11.5.0]: https://github.com/GitLabPHP/Client/compare/11.4.1...11.5.0