Update CHANGELOG

Author: ajanikow

CHANGELOG.md

@@ -1,6 +1,8 @@
 # Change Log
 
 ## [master](https://github.com/arangodb/kube-arangodb/tree/master) (N/A)
+
+## [1.2.40](https://github.com/arangodb/kube-arangodb/tree/1.2.40) (2024-04-10)
 - (Feature) Add Core fields to the Scheduler Container Spec
 - (Feature) Add Metadata fields to the Scheduler Pod Spec
 - (Feature) Extend Backup Details in DebugPackage