ci: Use latest version of actions/setup-python for better cache

[achimnol]

No description provided.

[codecov]

Codecov Report

Merging #45 (94dd886) into main (b405d54) will increase coverage by 13.70%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             main      #45       +/-   ##
===========================================
+ Coverage   65.54%   79.24%   +13.70%     
===========================================
  Files          16       16               
  Lines        1306     1306               
===========================================
+ Hits          856     1035      +179     
+ Misses        450      271      -179     

Impacted Files	Coverage Δ
src/aiotools/taskgroup/__init__.py	100.00% <0.00%> (+38.46%)	⬆️
src/aiotools/taskgroup/persistent.py	82.41% <0.00%> (+82.41%)	⬆️
src/aiotools/taskgroup/base.py	100.00% <0.00%> (+100.00%)	⬆️

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[achimnol]

Awaiting merge of actions/python-versions#147 ...