Adapt to Core 4.0 managed_by feature

aleksis/apps/paweljong/migrations/0001_initial.py

aleksis/apps/paweljong/migrations/0007_terms.py

aleksis/apps/paweljong/migrations/0013_info_mailings.py

...apps/paweljong/migrations/0014_move_sent_to_to_through.py

aleksis/apps/paweljong/migrations/0015_registrationstate.py

aleksis/apps/paweljong/migrations/0018_payment_with_tezor.py

aleksis/apps/paweljong/migrations/0021_checkpoint.py

...is/apps/paweljong/migrations/0025_add_managed_by_label.py

pyproject.toml