feat(settings): enforce upcoming security setting default changes

Django 3.0 introduces some changes of security settings.
3 jobs for ci-tests in 5 minutes and 35 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #5848
make_deb_package

00:04:40

 
  Test
passed #5850
deb_package_test

00:00:55

failed #5849
make_test

00:03:15

 
Name Stage Failure
failed
make_test Test
Ran 202 tests in 33.452s

FAILED (failures=16)
Destroying test database for alias 'default'...
make: *** [build/makefilet/include/python.mk:82: test-python] Error 1
. "/builds/grouprise/grouprise/gitlab-ci-build-venv/bin/activate" && "python3" manage.py test
System check identified no issues (0 silenced).
Cleaning up file based variables
ERROR: Job failed: exit code 1