Add Admin UI SDK 2.1.1 release notes

Author: asalloum5

src/pages/admin-ui-sdk/release-notes.md

@@ -8,6 +8,16 @@ keywords:
 
 # Adobe Commerce Admin UI SDK release notes
 
+## Version 2.1.1
+
+### Release date
+
+December 18, 2024
+
+### Bug fixes
+
+* Fix crash when accessing Admin UI SDK configuration in Commerce versions prior to 2.4.8-beta1.
+
 ## Version 2.1.0
 
 ### Release date