Django 5 support. - Githubissues

Django 5 support.
Drops support for python 3.7.
Drops support for Django 3.2.
Tests against Django 4.2, and 5.0 (dropping testing against 3.2, 4.0, and 4.1)
Test against all valid python versions 3.8 and above for the versions of Django we test against.
Massive update of dependencies as well.
Add tzdata as a dependency due to container instances possibly not having it by default.

Note: This relies on django-rest-framework 3.14.0 and not 3.15.1 (which has formal Django 5 support)... Iin 3.15.* there were changes with regards to unique_together in models. For us, that hits Ipaddress when creating a host, where we get:

ERROR    django.request:log.py:241 Internal Server Error: /api/v1/hosts/
Traceback (most recent call last):
  File ".../projects/uio/mreg/env/lib/python3.11/site-packages/django/core/handlers/exception.py", line 55, in inner
    response = get_response(request)
               ^^^^^^^^^^^^^^^^^^^^^
  File ".../projects/uio/mreg/env/lib/python3.11/site-packages/django/core/handlers/base.py", line 197, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File ".../projects/uio/mreg/env/lib/python3.11/site-packages/django/views/decorators/csrf.py", line 65, in _view_wrapper
    return view_func(request, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File ".../projects/uio/mreg/env/lib/python3.11/site-packages/django/views/generic/base.py", line 104, in view
    return self.dispatch(request, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File ".../projects/uio/mreg/env/lib/python3.11/site-packages/rest_framework/views.py", line 509, in dispatch
    response = self.handle_exception(exc)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File ".../projects/uio/mreg/env/lib/python3.11/site-packages/rest_framework/views.py", line 469, in handle_exception
    self.raise_uncaught_exception(exc)
  File ".../projects/uio/mreg/env/lib/python3.11/site-packages/rest_framework/views.py", line 480, in raise_uncaught_exception
    raise exc
  File ".../projects/uio/mreg/env/lib/python3.11/site-packages/rest_framework/views.py", line 506, in dispatch
    response = handler(request, *args, **kwargs)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File ".../projects/uio/mreg/mreg/api/v1/views.py", line 354, in post
    if ipserializer.is_valid():
       ^^^^^^^^^^^^^^^^^^^^^^^
  File ".../projects/uio/mreg/env/lib/python3.11/site-packages/rest_framework/serializers.py", line 223, in is_valid
    self._validated_data = self.run_validation(self.initial_data)
                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File ".../projects/uio/mreg/env/lib/python3.11/site-packages/rest_framework/serializers.py", line 444, in run_validation
    self.run_validators(value)
  File ".../projects/uio/mreg/env/lib/python3.11/site-packages/rest_framework/serializers.py", line 477, in run_validators
    super().run_validators(to_validate)
  File ".../projects/uio/mreg/env/lib/python3.11/site-packages/rest_framework/fields.py", line 553, in run_validators
    validator(value, self)
  File ".../projects/uio/mreg/env/lib/python3.11/site-packages/rest_framework/validators.py", line 169, in __call__
    checked_values = [
                     ^
  File ".../projects/uio/mreg/env/lib/python3.11/site-packages/rest_framework/validators.py", line 172, in <listcomp>
    if field in self.fields and value != getattr(serializer.instance, field)
                                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File ".../projects/uio/mreg/env/lib/python3.11/site-packages/django/db/models/fields/related_descriptors.py", line 264, in __get__
    raise self.RelatedObjectDoesNotExist(
mreg.models.host.Ipaddress.host.RelatedObjectDoesNotExist: Ipaddress has no host.

The issue comes from this bit of code: https://github.com/unioslo/mreg/blob/fa6ca20a41bd486cc8053a116f412b1d526a72ef/mreg/api/v1/views.py#L345-L351 combined with the unique_together constraint in Ipaddress: https://github.com/unioslo/mreg/blob/fa6ca20a41bd486cc8053a116f412b1d526a72ef/mreg/models/host.py#L25-L36.

Reported as part of https://github.com/encode/django-rest-framework/issues/9358.

unioslo / mreg

Django 5 support. #537