chore(datagrid-web): update changelog

Author: samuelreichert

packages/pluggableWidgets/datagrid-web/CHANGELOG.md

@@ -6,6 +6,10 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 ## [Unreleased]
 
+### Added
+
+- We added a new property for export to excel. The new property allows to set the cell export type and also the format for type number and date.
+
 ## [3.6.1] - 2025-10-14
 
 ### Fixed