Django 5 support.

[terjekv]

• 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:

mreg/mreg/api/v1/views.py

Lines 345 to 351 in fa6ca20

	ipserializer = IpaddressSerializer(ip, data=ipdata)
	if ipserializer.is_valid(raise_exception=True):
	self.perform_create(ipserializer)
	location = request.path + host.name
	return Response(
	status=status.HTTP_201_CREATED,
	headers={"Location": location},

combined with the unique_together constraint in Ipaddress:

mreg/mreg/models/host.py

Lines 25 to 36 in fa6ca20

	class Ipaddress(BaseModel):
	host = models.ForeignKey(
	Host, on_delete=models.CASCADE, db_column="host", related_name="ipaddresses"
	)
	ipaddress = models.GenericIPAddressField()
	macaddress = models.CharField(
	max_length=17, blank=True, validators=[validate_mac_address]
	)
	class Meta:
	db_table = "ipaddress"
	unique_together = (("host", "ipaddress"),)

.

Reported as part of encode/django-rest-framework#9358.

[coveralls]

coverage: 98.849% (-0.08%) from 98.925%
when pulling 21cc0e1 on django_5_support
into b497579 on master.

[pederhan]

LGTM