Adopt Ruff as code formatter

[jobovy]

Instead of the previous black. Minor formatting changes caused by this.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.91%. Comparing base (4561b4e) to head (f227cb7).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #635   +/-   ##
=======================================
  Coverage   99.91%   99.91%           
=======================================
  Files         200      200           
  Lines       29260    29260           
  Branches      563      564    +1     
=======================================
  Hits        29236    29236           
  Misses         24       24           

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