Update CHANGELOG.md

Author: GrahamCampbell

CHANGELOG.md

@@ -5,6 +5,10 @@ All notable changes to this project will be documented in this file.
 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).
 
+## [11.12.0] - 2023-10-XX
+
+* Add PHP 8.3 support
+
 ## [11.11.1] - 2023-10-XX
 
 * Fixed double encoding of job name in artifacts download