Use `ruff` instead of flake8 and black

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 98.01%. Comparing base (39ea4e4) to head (1e5c540).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #96 +/- ## ======================================= Coverage 98.01% 98.01% ======================================= Files 22 22 Lines 705 707 +2 Branches 96 96 ======================================= + Hits 691 693 +2 Misses 8 8 Partials 6 6 ```

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[leplatrem]

Pytest lint made me do weird things, because:

PT004 Fixture `setup_request_summary_logger` does not return anything, add leading underscore

And then:

def test_request_summary(caplog, test_client, _setup_request_summary_logger):
     # ...

PT019 Fixture `_setup_request_summary_logger` without value is injected as parameter, use `@pytest.mark.usefixtures` instead