Upgrade to Django 4.1.x

[theskumar]

• Upgrade Django, wagtail-purge, Django-pwned-password,django-basic-auth-ip-whitelist
• Move logic from DeleteView -> delete() to form_valid()
• Make test more robust
• Upgrade dj-database-url to 2.x, and enable CONN_HEALTH_CHECKS
• Bump django-two-factor-auth to 1.15.x that has confirmed support for Django 4.1
• Bump django-ratelimit to 4.1.0
• django-pwned-passwords seems be abandoned Update to work with Django 4.0 jamiecounsell/django-pwned-passwords#11 (replaced with it with it's fork)

[theskumar]

Update: Rebased on main and use official release version of wagtail-purge=0.3.0

[theskumar]

@frjo Update with main and resolved conflicts.

[frjo]

Test are failing, found this regarding SuccessURLAllowedHostsMixin:

• The undocumented django.contrib.auth.views.SuccessURLAllowedHostsMixin
  mixin is replaced by RedirectURLMixin.

https://github.com/django/django/blob/21382e2743d06efbf5623e7c9b6dccf2a325669b/docs/releases/4.1.txt#L573-L574

[theskumar]

Updated the code. The logic behind the SuccessURLAllowedHostsMixin is was already covered in the get_redirect_url mixin function.

[theskumar]

• Upgrade dj-database-url to 2.x, and enable CONN_HEALTH_CHECKS
• Bump django-two-factor-auth to 1.15.x that has confirmed support for Django 4.1
• Bump django-ratelimit to 4.1.0

[frjo]

@theskumar I merge in a couple of you other update PRs so this one has a small merge conflict now.

Will run this on test for a some days to be sure but it seems good to go in my testing.

[theskumar]

Thanks for the quick merging. I've resolve the conflicts with main.

[theskumar]

@frjo Would you be more comfortable if I stack the wagtail upgrade #3627 PR onto this django 4x PR? from testing perspective?

[frjo]

@theskumar Yes, I think it would be good to do the Wagtail 5 on top of Django 4. I think we can get this PR quickly tested and then merged in to main.

For Django 4.2.x LTS we need Wagtail 5 I believe. But that where I would like to go before the end of the year.

[theskumar]

Done. Updated the base of the wagtail 5x to this PR.