chore: revert version and changelog per reviewer feedback

Author: kartikey321

packages/dart_firebase_admin/CHANGELOG.md

@@ -1,10 +1,3 @@
-## 0.4.2 - 2025-12-13
-
-- **FEAT**: Added `Transaction.getQuery()` method to enable query execution within transactions with pessimistic locking
-- **FEAT**: Queries can now participate in Firestore transactions with full ACID guarantees
-- **FEAT**: Added support for lazy transaction initialization with queries
-- **TEST**: Added 10 comprehensive tests for query transaction scenarios
-
 ## 0.4.1 - 2025-03-21
 
 - Bump intl to `0.20.0`