{doc} Update CHANGELOG for 3.3.0

[skip ci]

Author: asmaloney

CHANGELOG.md

@@ -2,7 +2,7 @@
 
 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).
 
-## 3.3.0 - (in progress)
+## [3.3.0](https://github.com/asmaloney/libE57Format/releases/tag/v3.3.0) - 2025-10-24
 
 ### Added