MAINT: Reduce maximum code complexity to 30

[stefan6419846]

Closes #3372.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.38%. Comparing base (14ef6b1) to head (f120a62).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3620      +/-   ##
==========================================
+ Coverage   97.36%   97.38%   +0.02%     
==========================================
  Files          55       55              
  Lines        9846     9845       -1     
  Branches     1799     1799              
==========================================
+ Hits         9587     9588       +1     
+ Misses        153      151       -2     
  Partials      106      106              

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