Django-filter

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* Adds initial compatibility with Django 5.0, prior to Django 5.0a1.

* Updates packaging to use pyproject.toml and Flit.

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* Deprecated the schema generation methods of the DRF related ``DjangoFilterBackend``.
These will be removed in version 25.1.

You should use `drf-spectacular <https://drf-spectacular.readthedocs.io/en/latest/>`_
for generating OpenAPI schemas with DRF.

* In addition, stopped testing against the (very old now) ``coreapi`` schema generation.
These methods should continue to work if you're using them until v25.1, but
``coreapi`` is no longer maintained, and is raising warnings against the current
versions of Python. To workaround this is not worth the effort at this point.

* Updated Polish translations.

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* Declared support for Django 4.2.

* Various updated and new translations. Thanks to all who contributed, and
Weblate for hosting.

* Fixed QueryArrayWidget.value_from_datadict() to not mutate input data. (1540)

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* Update supported Python and Django versions: minimal Python is now 3.7,
minimum Django is now 3.2.

* Added testing for Python 3.10 and Django 4.1.

* Removed outdated deprecated warnings for code removed in version 2.1.

* Removed `filter_class` (use `filterset_class`) and `filter_fields`
(`filterset_fields`) that were deprecated in [version 2.0
(2018)](https://django-filter.readthedocs.io/en/main/guide/migration.html#view-attributes-renamed-867).

* The code base is now formatted with Black.

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This is a maintenance release updating CI testing for the latest
non-end-of-life versions of Python and Django, and updating package metadata
accordingly.

With this release ``django-filter`` is switching to a two-part CalVer
versioning scheme, such as ``21.1``. The first number is the year. The second
is the release number within that year.

On an on-going basis, Django-Filter aims to support all current Django
versions, the matching current Python versions, and the latest version of
Django REST Framework.

Please see:

* `Status of supported Python branches <https://devguide.python.org/#status-of-python-branches>`_
* `List of supported Django versions <https://www.djangoproject.com/download/#support-versions>`_

Support for Python and Django versions will be dropped when they reach
end-of-life. Support for Python versions will dropped when they reach
end-of-life, even when still supported by a current version of Django.

Other breaking changes are rare. Where required, every effort will be made to
apply a "Year plus two" deprecation period. For example, a change initially
introduced in ``23.x`` would offer a fallback where feasible and finally be
removed in ``25.1``. Where fallbacks are not feasible, breaking changes without
deprecation will be called out in the release notes.

Beyond that change, there are few changes. Some small bugfixes, improvements to
localisation, and documentation tweaks. Thanks to all who were involved.

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* SECURITY: Added a ``MaxValueValidator`` to the form field for
``NumberFilter``. This prevents a potential DoS attack if numbers with very
large exponents were subsequently converted to integers.

The default limit value for the validator is ``1e50``.

The new ``NumberFilter.get_max_validator()`` allows customising the used
validator, and may return ``None`` to disable the validation entirely.

* Added testing against Django 3.1 and Python 3.9.

In addition tests against Django main development branch are now required to
pass.