chore: update changelog for OIDC user account linking feature

CHANGELOG.md

@@ -5,12 +5,14 @@ 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).
 
-## 2.227.0 - 2026-01-02
+### Unreleased
 
 ### Added
 
 - Added the feature to link an existing token-based user account to a OpenID Connect (`OIDC`) authentication provider
 
+## 2.227.0 - 2026-01-02
+
 ### Changed
 
 - Initialized the input properties in the _FIRE_ calculator