ci: disable pip package caching in actions/setup-python

[afuetterer]

This reverts the change introduced in d5e476a.

I did not realize how many items your test matrix includes, each cache artifact is a few 100 megs and you have a lot of them. Your cache is overflowing, sorry about that. I suggest turning off the cache again.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.95%. Comparing base (1ea4032) to head (12dee90).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #324      +/-   ##
==========================================
+ Coverage   84.93%   85.95%   +1.02%     
==========================================
  Files          17       17              
  Lines        4202     4202              
  Branches      988      988              
==========================================
+ Hits         3569     3612      +43     
+ Misses        474      431      -43     
  Partials      159      159              

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[lkstrp]

Thanks for noticing @afuetterer