Set release date (Azure#50570)

Co-authored-by: Farhad Jabiyev <[email protected]>

Author: FarhadJabiyev

sdk/communication/Azure.Communication.Sms/CHANGELOG.md

@@ -1,6 +1,6 @@
 # Release History
 
-## 1.1.0-beta.3 (Unreleased)
+## 1.1.0-beta.3 (2025-06-12)
 
 ### Features Added
  - Introduced Messaging Connect support in the .NET SDK.