Replace Black with 'ruff format'

[jodal]

• Bump ruff from 0.0.290 to 0.1.4
• Replace Black with 'ruff format'

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (d930c60) 94.16% compared to head (dffea89) 94.16%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #210   +/-   ##
=======================================
  Coverage   94.16%   94.16%           
=======================================
  Files          14       14           
  Lines         566      566           
  Branches       83       83           
=======================================
  Hits          533      533           
  Misses         28       28           
  Partials        5        5           

Files	Coverage Δ
src/pykka/_actor.py	97.41% <ø> (ø)

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