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Update for Django 4.1, 4.2

Add Django 4.1 Compatibility

Checks Django version to make sure.

change python 3.6 versison

Bugfix with Django 4.2

change `url` by `path`

from django.core.files.storage import File, Storage
ImportError: cannot import name 'File' from 'django.core.files.storage'

As the `deps` for `django21` and `django22` were undefined, `tox` ended
up installing the latests version of Django in the environment instead.

if `request.META["HTTP_USER_AGENT"]` is not set the fallback value should an empty string instead of None
or else we get a `TypeError: argument of type 'NoneType' is not iterable` on `if 'WebKit' in user_agent:`

Now I raise a django builtin permission denied instead of writing a custom HttpResponse

otherwise the coverage env is missing these dependencies