fix: update celery config imports

[mistercrunch]

closes #29708

related error in docker-compose:

superset_worker       | The full contents of the message headers:
superset_worker       | {'lang': 'py', 'task': 'reports.scheduler', 'id': 'b150a39b-57bb-4a58-9556-cc7d1a47132a', 'shadow': None, 'eta': None, 'expires': None, 'group': None, 'group_index': None, 'retries': 0, 'tim
elimit': [None, None], 'root_id': 'b150a39b-57bb-4a58-9556-cc7d1a47132a', 'parent_id': None, 'argsrepr': '()', 'kwargsrepr': '{}', 'origin': 'gen8@daf2692c865a', 'ignore_result': False, 'replaced_task_nesting': 0,
'stamped_headers': None, 'stamps': {}}
superset_worker       |
superset_worker       | The delivery info for this task is:
superset_worker       | {'exchange': '', 'routing_key': 'celery'}
superset_worker       | Traceback (most recent call last):
superset_worker       |   File "/usr/local/lib/python3.10/site-packages/celery/worker/consumer/consumer.py", line 659, in on_task_received
superset_worker       |     strategy = strategies[type_]
superset_worker       | KeyError: 'reports.scheduler'

I confirmed that this issue is gone after applying this fix and re-running docker-compose up

[sadpandajoe]

@supersetbot label 4.1