infra: Install only tox for python-package workflow

[speller26]

Issue #, if available:

Description of changes:

Testing done:

Merge Checklist

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (49c1368) 100.00% compared to head (1e28196) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #165   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           93        93           
  Lines         1361      1361           
  Branches        25        25           
=========================================
  Hits          1361      1361           

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