AsyncTaskiqDecoratedTask().kicker().with_labels() mutates task labels #301

@pytest.mark.anyio
async def test_with_label() -> None:
    trace_ids = {}

    class Tracer(TaskiqMiddleware):
        def pre_send(self, message: TaskiqMessage) -> TaskiqMessage | Coroutine[Any, Any, TaskiqMessage]:
            nonlocal trace_ids
            trace_ids[tuple(message.args)] = message.labels.get("trace_id")
            return super().pre_send(message)

    broker = InMemoryBroker().with_middlewares(Tracer())

    @broker.task()
    def run_task(a) -> int:
        return a

    task1 = await run_task.kicker().with_labels(trace_id="11111").kiq(1)
    task2 = await run_task.kicker().with_labels(trace_id="22222").kiq(2)
    task3 = await run_task.kiq(3)

    await task1.wait_result(timeout=1)
    await task2.wait_result(timeout=1)
    await task3.wait_result(timeout=1)

    assert trace_ids == {(1,): "11111", (2,): "22222", (3,): None}

class CustomTask(AsyncTaskiqDecoratedTask):

    def kicker(self) -> AsyncKicker[_FuncParams, _ReturnType]:
        """
        This function returns kicker object.

        Kicker is a object that can modify kiq request
        before sending it.

        :return: AsyncKicker instance.
        """
        return AsyncKicker(
            task_name=self.task_name,
            broker=self.broker,
            labels=deepcopy(self.labels),
        )


broker.decorator_class = CustomTask