Update changelog

Author: ltrouton

CHANGELOG.md

@@ -4,6 +4,8 @@ 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).
 
+# 15.1.1 - 2025-12-19
+
 ## Unreleased
 - Fixed an issue where using bedrock-auto with rspack bundling resulted in an error. #TINY-13550