chore(datagrid-web): add changelog entry

Author: samuelreichert

packages/pluggableWidgets/datagrid-web/CHANGELOG.md

@@ -10,6 +10,10 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 - We added configurable selection count visibility and clear selection button label template for improved row selection management.
 
+### Fixed
+
+- The property panel now shows keep selection property when datagrid is set to single selection.
+
 - We fixed an issue where missing consistency checks for the captions were causing runtime errors instead of in Studio Pro
 
 ## [3.6.1] - 2025-10-14