Fixes changelog

Author: LordHepipud

doc/100-General/10-Changelog.md

@@ -7,8 +7,6 @@ documentation before upgrading to a new release.
 
 Released closed milestones can be found on [GitHub](https://github.com/Icinga/icinga-powershell-framework/milestones?state=closed).
 
-## 1.13.3 (tbd)
-
 ## 1.13.3 (2025-05-08)
 
 [Issues and PRs](https://github.com/Icinga/icinga-powershell-framework/milestone/39)