Django 4.0 and Python 3.10 support

[ElSaico]

Closes #462 (needed to upgrade pytest because of pytest-dev/pytest#8546)
Closes #465 (removed all pytz-isms and fixed incompatibilities with django-timezone-field 5.0)
Closes #518 (was one of such pytz-isms)

[auvipy]

mu only concern is does django below 4 supoort zoneinfo?

[hassanselim0]

my only concern is does django below 4 support zoneinfo?

According to this: https://docs.djangoproject.com/en/4.0/releases/4.0/#zoneinfo-default-timezone-implementation
Django 3.2 was the first version to support non-pytz time zones, which I assume means that it would support zoneinfo.
This means you'll need to update the dependency from >=2.2 to >=3.2.

[auvipy]

our travis CI don't work anymore, I am working on moving to github actions

[nickmccullum]

Any update on this? This is blocking us from upgrading one of our projects to Django 4, and we would love to get it merged.

[auvipy]

needs rebase

[auvipy]

builds are failing

[ElSaico]

The build errors seem to be related to RabbitMQ being down during tests - except for the 3.8 one, which seems to call the 3.9 executable (and obviously fail) for whatever reason.

[tremechus]

@ElSaico checking in, looks like there is a rebase request in order to move this forward, is that something you can push?

[ElSaico]

@auvipy Made a number of fixes in GitHub Actions, including stuff that breaks on master already.

The only things broken now are the Sphinx builds, because of this:

Warning, treated as error:
  extlinks: Sphinx-6.0 will require a caption string to contain exactly one '%s' and all other '%' need to be escaped as '%%'.

I've fixed the entries on conf.py, but it seems like sphinx_celery has the same problem anyway. Thus we have two choices:

• Drop -W from the sphinx-build calls, avoiding erroring out on warnings
• Fix the extlinks entries in sphinx_celery

[auvipy]

• Fix the extlinks entries in sphinx_celery

Fix the extlinks entries in sphinx_celery -- should be the go :)

[auvipy]

python 3.8 builds seems to be a github network issue

[auvipy]

we can fix the sphinx issues in another PR