infra: fix tox allowlist_externals

[AbeCoull]

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 ✅

Project coverage is 100.00%. Comparing base (971ce40) to head (f10434a).

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #248   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           48        48           
  Lines         3712      3712           
  Branches       889       889           
=========================================
  Hits          3712      3712           

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