Upgrade to actions/setup-python@v3

[hugovk]

Committed via https://github.com/asottile/all-repos

[codecov]

Codecov Report

Merging #54 (d60002a) into main (adc953a) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #54   +/-   ##
=======================================
  Coverage   55.93%   55.93%           
=======================================
  Files           6        6           
  Lines         438      438           
=======================================
  Hits          245      245           
  Misses        193      193           

Flag	Coverage Δ
GHA_Ubuntu	55.93% <ø> (ø)
GHA_macOS	55.93% <ø> (ø)

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