correct typing

Signed-off-by: varun-edachali-dbx <varun.edachali@databricks.com>

Author: varun-edachali-dbx

src/databricks/sql/backend/thrift_backend.py

@@ -820,7 +820,7 @@ def _results_message_to_execute_response(self, resp, operation_state):
 
     def get_execution_result(
         self, command_id: CommandId, cursor: "Cursor"
-    ) -> ExecuteResponse:
+    ) -> "ResultSet":
         thrift_handle = command_id.to_thrift_handle()
         if not thrift_handle:
             raise ValueError("Not a valid Thrift command ID")