celery-hasytack broken since celery 5.0
File "/home/nik/Teckids/schul-frei/Entwicklung/AlekSIS/AlekSIS/apps/official/AlekSIS-Core/.venv/lib/python3.9/site-packages/celery_haystack/tasks.py", line 11, in <module>
from celery.task import Task # noqa
ModuleNotFoundError: No module named 'celery.task'