Use Ruff and stop using flake8

[yhino]

Use Ruff and stop using flake8.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.01 🎉

Comparison is base (18de64c) 97.20% compared to head (de6acd6) 97.22%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #56      +/-   ##
==========================================
+ Coverage   97.20%   97.22%   +0.01%     
==========================================
  Files           5        5              
  Lines         143      144       +1     
==========================================
+ Hits          139      140       +1     
  Misses          4        4              

Flag	Coverage Δ
unittests	97.22% <100.00%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pipenv_poetry_migrate/cli.py	95.65% <100.00%> (ø)
pipenv_poetry_migrate/migrate.py	96.70% <100.00%> (ø)
pipenv_poetry_migrate/translator.py	100.00% <100.00%> (ø)

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