sdks/python: fix linting issues

Author: mohamedawnallah

sdks/python/apache_beam/transforms/enrichment_handlers/cloudsql.py

@@ -316,7 +316,11 @@ def __enter__(self):
     self._engine = create_engine(
         url=self._connection_config.get_db_url(), creator=connector)
 
-  def _execute_query(self, query: str, is_batch: bool, **params):
+  def _execute_query(
+      self,
+      query: str,
+      is_batch: bool,
+      **params) -> Union[List[Dict[str, Any]], Dict[str, Any]]:
     connection = None
     try:
       connection = self._engine.connect()

sdks/python/apache_beam/transforms/enrichment_handlers/cloudsql_it_test.py

@@ -90,7 +90,7 @@ def start_sql_db_container(
       sql_client_retries=3) -> Optional[SQLDBContainerInfo]:
     info = None
     for i in range(sql_client_retries):
-      sql_db_container = None
+      sql_db_container = DbContainer("")
       try:
         if database_type == DatabaseTypeAdapter.POSTGRESQL:
           user, password, db_id = "test", "test", "test"