chore: revert HISTORY.md — changelog entry not required

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: swastikmishra-atlan

HISTORY.md

@@ -1,10 +1,3 @@
-## 8.5.4 (March 5, 2026)
-
-### Features
-
-- Added support for new connector type: `AtlanConnectorType.ALLOYDB_POSTGRES`.
-- Added support for new workflow package: `WorkflowPackage.ALLOYDB_POSTGRES`.
-
 ## 8.5.3 (February 17, 2026)
 
 ### QOL Improvements