Merge branch 'main' into v3

[medihack]

Keep our v3 branch up-to-date.

• I had to rename a Django migration in the v3 branch because of some conflict (taking the migrations of the main branch into account).
• aborting is not anymore, so it is also not visible anymore in the Django admin. Maybe we can show the abort_requested flag there.

[github-actions[bot]]

Coverage report

Click to see where and how coverage changed

File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
procrastinate
app.py
manager.py
tasks.py
testing.py
utils.py
procrastinate/contrib/django
django_connector.py
models.py					106, 134
procrastinate/contrib/sphinx
__init__.py
Project Total

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