Fixed typo

Author: clorenz

CHANGELOG.md

@@ -7,7 +7,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
-## [6.0.0](https://github.com/dbmdz/xml-toolbox/releases/tag/5.0.0) - 2025-06-12
+## [6.0.0](https://github.com/dbmdz/xml-toolbox/releases/tag/6.0.0) - 2025-06-12
 
 ### Changed