setting worker config results in worker error

[kgk]

Setting integer properties results in the worker failing to start.. we could default to use_celeryconfig but would prefer
to keep the config in the ini file.

[celery]
...
worker_max_tasks_per_child=1024

on worker start :

"levelname": "CRITICAL", "name": "celery.worker", "message": "Unrecoverable error: AssertionError()", "exc_info": "Traceback (most recent call last):
  File \"/opt/viqi/lib/python3.10/site-packages/celery/worker/worker.py\", line 202, in start
    self.blueprint.start(self)
  File \"/opt/viqi/lib/python3.10/site-packages/celery/bootsteps.py\", line 116, in start
    step.start(parent)
  File \"/opt/viqi/lib/python3.10/site-packages/celery/bootsteps.py\", line 365, in start
    return self.obj.start()
  File \"/opt/viqi/lib/python3.10/site-packages/celery/concurrency/base.py\", line 130, in start
    self.on_start()
  File \"/opt/viqi/lib/python3.10/site-packages/celery/concurrency/prefork.py\", line 109, in on_start
    P = self._pool = Pool(processes=self.limit,
  File \"/opt/viqi/lib/python3.10/site-packages/celery/concurrency/asynpool.py\", line 464, in __init__
    super().__init__(processes, *args, **kwargs)
  File \"/opt/viqi/lib/python3.10/site-packages/billiard/pool.py\", line 1045, in __init__
    self._create_worker_process(i)
  File \"/opt/viqi/lib/python3.10/site-packages/celery/concurrency/asynpool.py\", line 482, in _create_worker_process
    return super()._create_worker_process(i)
  File \"/opt/viqi/lib/python3.10/site-packages/billiard/pool.py\", line 1142, in _create_worker_process
    w = self.WorkerProcess(self.Worker(
  File \"/opt/viqi/lib/python3.10/site-packages/billiard/pool.py\", line 241, in __init__
    assert maxtasks is None or (type(maxtasks) == int and maxtasks > 0)
AssertionError",

It appears all fields are loaded as str from config section