Fixes this crash:
Traceback (most recent call last):
File "/home/stsp/.virtualenvs/swh/lib/python3.11/site-packages/_pytest/config/__init__.py", line 781, in import_plugin
__import__(importspec)
File "/home/stsp/.virtualenvs/swh/lib/python3.11/site-packages/_pytest/assertion/rewrite.py", line 178, in exec_module
exec(co, module.__dict__)
File "/home/stsp/swh-environment/swh-scheduler/swh/scheduler/pytest_plugin.py", line 9, in <module>
from celery.contrib.testing import worker
File "/home/stsp/.virtualenvs/swh/lib/python3.11/site-packages/celery/contrib/testing/worker.py", line 8, in <module>
import celery.worker.consumer # noqa
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/stsp/.virtualenvs/swh/lib/python3.11/site-packages/celery/worker/consumer/__init__.py", line 4, in <module>
from .consumer import Consumer
File "/home/stsp/.virtualenvs/swh/lib/python3.11/site-packages/celery/worker/consumer/consumer.py", line 24, in <module>
from celery.app.trace import build_tracer
File "/home/stsp/.virtualenvs/swh/lib/python3.11/site-packages/celery/app/trace.py", line 14, in <module>
from billiard.einfo import ExceptionInfo, ExceptionWithTraceback
ImportError: cannot import name 'ExceptionWithTraceback' from 'billiard.einfo' (/home/stsp/.virtualenvs/swh/lib/python3.11/site-packages/billiard/einfo.py)