Use psutil logical for test examples

[hoxbro]

See https://pytest-xdist.readthedocs.io/en/latest/distribution.html#running-tests-across-multiple-cpus

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.80%. Comparing base (6c96c7e) to head (1051c5d).
Report is 21 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1404      +/-   ##
==========================================
+ Coverage   87.39%   88.80%   +1.40%     
==========================================
  Files          50       51       +1     
  Lines        7490     7494       +4     
==========================================
+ Hits         6546     6655     +109     
+ Misses        944      839     -105     

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