Prepare @azure/communication-identity 1.2.0-beta.2 release (Azure#21127)

* updated version number constant

Author: petrsvihlik

sdk/communication/communication-identity/src/constants.ts

@@ -1,4 +1,4 @@
 // Copyright (c) Microsoft Corporation.
 // Licensed under the MIT license.
 
-export const SDK_VERSION: string = "1.1.0-beta.1";
+export const SDK_VERSION: string = "1.1.0-beta.2";