switch flake8 -> ruff

[samuelcolvin]

No description provided.

[codspeed-hq]

CodSpeed Performance Report

Merging #334 ruff (873ad9f) will not alter performances.

Summary

🔥 2 improvements
❌ 0 regressions
✅ 61 untouched benchmarks

🆕 0 new benchmarks
⁉️ 0 dropped benchmarks

Benchmarks breakdown

	Benchmark	main	ruff	Change
🔥	test_many_models_core_model	99.8 ms	15.9 ms	84.04%
🔥	test_list_of_nullable_core	1,084.8 µs	916 µs	15.57%

[codecov-commenter]

Codecov Report

Merging #334 (873ad9f) into main (1900f4a) will not change coverage.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #334   +/-   ##
=======================================
  Coverage   97.35%   97.35%           
=======================================
  Files          57       57           
  Lines        6890     6890           
  Branches       46       46           
=======================================
  Hits         6708     6708           
  Misses        182      182           

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[samuelcolvin]

@art049 there's no code changes in this pr, so the 84% change must be an artifact of how you're running or measuring the benchmarks.