Update release date for version 2.1 (#487)

This PR just updates a small date in the RN for 2.1

Author: Andriciuc

documentation/variables.yml

@@ -8,7 +8,7 @@ tdebranch: release-2.1
 
 date:
 
-  2_1: '2025-11-30'
+  2_1: '2025-11-28'
   GA20: '2025-09-01'
   GA10: '2025-06-30'
   RC2: '2025-05-29'