Remove a redundant Python 4 constraint

[alessio-locatelli]

Could you please release a new version after the changes are merged?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.23%. Comparing base (8d28ac7) to head (9c87747).
⚠️ Report is 36 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #364      +/-   ##
==========================================
+ Coverage   96.20%   96.23%   +0.02%     
==========================================
  Files          10       10              
  Lines        1081     1089       +8     
  Branches      188      111      -77     
==========================================
+ Hits         1040     1048       +8     
  Misses         30       30              
  Partials       11       11              

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[JWCook]

Done!