DM-35692: unpin pip, update setup-python to v4

[mwittgen]

Checklist

• ran Jenkins
• added a release note for user-visible changes to doc/changes

[codecov]

Codecov Report

Base: 15.38% // Head: 15.38% // No change to project coverage 👍

Coverage data is based on head (d6ed499) compared to base (7a5deba).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #14   +/-   ##
=======================================
  Coverage   15.38%   15.38%           
=======================================
  Files           4        4           
  Lines        1313     1313           
  Branches      288      278   -10     
=======================================
  Hits          202      202           
  Misses       1109     1109           
  Partials        2        2           

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