Deserializes all transactions for this batch and
        archives the file.

def next_task(self, item, raise_exceptions=None, **kwargs):
        """Deserializes all transactions for this batch and
        archives the file.
        """
        filename = os.path.basename(item)
        batch = self.get_batch(filename)
        tx_deserializer = self.tx_deserializer_cls(
            allow_self=self.allow_self, override_role=self.override_role
        )
        try:
            tx_deserializer.deserialize_transactions(
                transactions=batch.saved_transactions
            )
        except (DeserializationError, TransactionDeserializerError) as e:
            raise TransactionsFileQueueError(e) from e
        else:
            batch.close()
            self.archive(filename)