Merge branch '247-adapt-to-core-4-0' into 'master'

aleksis/apps/alsijil/managers.py

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

aleksis/apps/alsijil/migrations/0002_excuse_type.py

aleksis/apps/alsijil/migrations/0003_extra_mark.py

aleksis/apps/alsijil/migrations/0008_global_permissions.py

aleksis/apps/alsijil/migrations/0009_group_roles.py

aleksis/apps/alsijil/migrations/0010_events_extra_lessons.py

...s/apps/alsijil/migrations/0013_fix_uniqueness_per_site.py

.../apps/alsijil/migrations/0018_add_managed_by_app_label.py

aleksis/apps/alsijil/migrations/0019_drop_sites.py

aleksis/apps/alsijil/models.py

...apps/alsijil/templates/alsijil/class_register/lesson.html

...s/alsijil/templates/alsijil/class_register/week_view.html

pyproject.toml