Replace flake8 by ruff 🚀

[JonathanPlasse]

Ruff is the new flake8 (near instant linting).
Check out the launch blog article.

[codecov]

Codecov Report

Merging #155 (e30a95a) into master (07ddcaa) will increase coverage by 1.1%.
The diff coverage is 100.0%.

❗ Current head e30a95a differs from pull request most recent head cb9fa25. Consider uploading reports for the commit cb9fa25 to get more accurate results

@@           Coverage Diff            @@
##           master    #155     +/-   ##
========================================
+ Coverage    88.3%   89.4%   +1.1%     
========================================
  Files           7       7             
  Lines         540     552     +12     
  Branches       57     110     +53     
========================================
+ Hits          477     494     +17     
+ Misses         40      37      -3     
+ Partials       23      21      -2     

Impacted Files	Coverage Δ
asyncio_mqtt/client.py	80.6% <100.0%> (+1.0%)	⬆️
asyncio_mqtt/types.py	100.0% <100.0%> (ø)
tests/test_client.py	100.0% <100.0%> (ø)
tests/test_error.py	100.0% <100.0%> (ø)
tests/conftest.py	100.0% <0.0%> (+33.3%)	⬆️

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[frederikaalund]

I'm all for this. I've followed ruff for a while and it looks to be the next big thing for static analysis in python. :)

Personally, I'd use ruff alongside mypy, pylint, and black. That's because I care more about "static analysis coverage" than speed. It's a tradeoff between development velocity and code quality guarantees.

In any case, I vote that we go ahead and replace flake8 with ruff. 👍 There is no contest there. 😄