bump changelog

Author: nvnieuwk

CHANGELOG.md

@@ -13,6 +13,7 @@
 2. Added a missing inherited method to the observer to fix issues with workflow output publishing
 3. Fixed unexpected failures with samplesheet schemas using `anyOf`, `allOf` and `oneOf`
 4. Fixed an error with help messages when the `type` keyword was missing
+5. Fix compilation errors in Java 21
 
 ## Improvements