Fix test with recent versions of pip/build

[astrofrog]

Should hopefully fix CI

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.46%. Comparing base (32017c0) to head (812dd04).
⚠️ Report is 10 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #142   +/-   ##
=======================================
  Coverage   75.46%   75.46%           
=======================================
  Files           4        4           
  Lines         379      379           
=======================================
  Hits          286      286           
  Misses         93       93           

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