fix: fixed invalid '| None' syntax for python 3.9 (#9993)

web/pgadmin/llm/tools/database.py

@@ -84,7 +84,7 @@ def _get_connection(sid: int, did: int, conn_id: str):
         )
 
 
-def _connect_readonly(_manager, conn, conn_id: str) -> tuple[bool, str | None]:
+def _connect_readonly(_manager, conn, conn_id: str) -> tuple[bool, Optional[str]]:
     """
     Establish a read-only connection.