Updating changelog with release date (#40688)

* Updating changelog with release date

* Update sdk/confidentialledger/azure-confidentialledger/CHANGELOG.md

Co-authored-by: Copilot <[email protected]>

* Updating release date to unrelease version

* Update CHANGELOG.md

---------

Co-authored-by: Copilot <[email protected]>

Author: amruthashree18

sdk/confidentialledger/azure-confidentialledger/CHANGELOG.md

@@ -1,13 +1,14 @@
 # Release History
 
-## 1.2.0b1 (Unreleased)
+## 1.2.0b1 (2025-04-23)
 
 ### Features Added
 
 - Add and manage custom roles with the `update_user_defined_role`, `get_user_defined_role` and `delete_user_defined_role` methods
 - Add and manage ledger users with the `create_or_update_ledger_user`, `delete_ledger_user`, `get_ledger_user` and `list_ledger_users` methods
 - Add and manage programmable endpoints with the `create_user_defined_endpoint` and `get_user_defined_endpoint` methods
 - A user can now be associated with more than one role
+- Added user defined functions support for ledger API
 
 ### Other Changes