add changelog

Author: Siedlerchr

CHANGELOG.md

@@ -15,6 +15,8 @@ Note that this project **does not** adhere to [Semantic Versioning](https://semv
 
 ### Fixed
 
+- We fixed an issue where pressing <kbd>ESC</kbd> in the preferences dialog would not always close the dialog. [#8888](https://github.com/JabRef/jabref/issues/8888)
+
 ### Removed
 
 ## [6.0-alpha.3] – 2025-10-30