fix: use pytest native method name

[frostming]

Fix #298

This eliminates the mass warning when running pytest:

    tests/test_storage_redis.py::TestRedisCache::test_set_expiration_int is using nose-specific method: `setup(self)`
  To remove this warning, rename it to `setup_method(self)`
  See docs: https://docs.pytest.org/en/stable/deprecations.html#support-for-tests-written-for-nose
    fixture_result = next(generator)

Signed-off-by: Frost Ming [email protected]

[frostming]

The black formatting is triggered by bulk replace.