tests failures against Pytest 7.2.0

[stanislavlevin]

https://docs.pytest.org/en/latest/changelog.html#pytest-7-2-0-2022-10-23:

#9886: The functionality for running tests written for nose has been officially deprecated.
This includes:

• Plain setup and teardown functions and methods: this might catch users by surprise, as setup() and teardown() are not pytest idioms, but part of the nose support.
• Setup/teardown using the @with_setup decorator.

For more details, consult the deprecation docs.

This leads to identical errors in djangorestframework's tests

...
/usr/lib/python3/site-packages/_pytest/python.py:909: in xunit_setup_method_fixture
    warnings.warn(
E   pytest.PytestRemovedIn8Warning: Support for nose tests is deprecated and will be r
emoved in a future release.
E   tests/test_serializer_nested.py::TestNotRequiredNestedSerializerWithMany::test_mul
tipart_validate is using nose-specific method: `setup(self)`
E   To remove this warning, rename it to `setup_method(self)`
E   See docs: https://docs.pytest.org/en/stable/deprecations.html#support-for-tests-wr
itten-for-nose
...
==== 1178 passed, 124 skipped, 1 xpassed, 2 warnings, 122 errors in 39.40s =====