code: def modify_ack_deadline(self, items):
          
          ack_ids = [item.ack_id for item in items]
          seconds = [item.seconds for item in items]
  
          request = types.StreamingPullRequest(
              modify_deadline_ack_ids=ack_ids, modify_deadline_seconds=seconds
          )
          self._manager.send(request)
docs: Modify the ack deadline for the given messages.
  
          Args:
              items(Sequence[ModAckRequest]): The items to modify.