Bump the version of virtualenv in tox.ini to pull in the correct version of pip

[pyrco]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.90%. Comparing base (6585e06) to head (a1c34f0).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #24   +/-   ##
=======================================
  Coverage   80.90%   80.90%           
=======================================
  Files           9        9           
  Lines         885      885           
=======================================
  Hits          716      716           
  Misses        169      169           

Flag	Coverage Δ
unittests	80.90% <ø> (ø)

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