fix to python-package script from andy's PR

[LonelyCat124]

@arporter I put your fix into a standalone PR so we can have it on master now - ready for a look when you have time.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (a7ea7cc) to head (6f3c375).

Additional details and impacted files

@@            Coverage Diff            @@
##            master     #3462   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          393       393           
  Lines        55067     55067           
=========================================
  Hits         55067     55067           

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[arporter]

Thanks for creating this @LonelyCat124.

It's slightly naughty of me to review this but as it's a one-line change to a workflow file that demonstrably fixes the CI and improves consistency I'm going to approve it anyway :-)