Bookworm compatibility

Hello!

The quick-setup.sh program is not compatible with bookworm. It tries to install python3-django-jsonfield, which is only in buster and bullseye. It also does not install python3-django-responses, which seems to be required to run tests.

See documentation here: https://qa.pages.debian.net/distro-tracker/admin/installation.html#requirements

The bullseye + backports instructions work once python3-django-responses is manually installed.

Thanks,

Martin