Update CHANGELOG

Author: driesvints

CHANGELOG.md

@@ -1,6 +1,12 @@
 # Release Notes
 
-## [Unreleased](https://github.com/laravel/octane/compare/v1.2.4...1.x)
+## [Unreleased](https://github.com/laravel/octane/compare/v1.2.5...1.x)
+
+## [v1.2.5](https://github.com/laravel/octane/compare/v1.2.4...v1.2.5) - 2022-03-29
+
+### Fixed
+
+- Optimize PHP8.1 compatibility by @sy-records in https://github.com/laravel/octane/pull/499
 
 ## [v1.2.4](https://github.com/laravel/octane/compare/v1.2.3...v1.2.4) - 2022-03-08