DM-35692: unpin pip version

[mwittgen]

Checklist

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

[mwittgen]

Rather use DM-35692 for this.

[codecov]

Codecov Report

Base: 86.03% // Head: 86.07% // Increases project coverage by +0.03% 🎉

Coverage data is based on head (844d180) compared to base (7f03f9c).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #37      +/-   ##
==========================================
+ Coverage   86.03%   86.07%   +0.03%     
==========================================
  Files          22       22              
  Lines        2736     2736              
  Branches      505      505              
==========================================
+ Hits         2354     2355       +1     
  Misses        303      303              
+ Partials       79       78       -1     

Impacted Files	Coverage Δ
python/lsst/resources/http.py	84.78% <0.00%> (+0.43%)	⬆️

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