update changelog

Author: oliche

CHANGELOG.md

@@ -6,7 +6,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 
-## [3.4.2] UNRELEASED
+## [3.4.2] 2025-11-24
 
 ### Fixed
 - public method to create insertions in `ibllib.ephys.spikes`