Update changelog

Author: nhinze23

CHANGELOG.md

@@ -5,6 +5,8 @@ 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).
 
 ## [Unreleased]
+
+## [v5.0.3-5] - 2024-01-03
 ### Changed
 - [#9] Use existing secret for backup-storage