test: Fix certificate being not trusted on MacOS

[mzaniolo]

closes: #35

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.76%. Comparing base (a787e25) to head (ed33336).
Report is 1 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #76   +/-   ##
=======================================
  Coverage   86.76%   86.76%           
=======================================
  Files           7        7           
  Lines        1352     1352           
=======================================
  Hits         1173     1173           
  Misses        179      179           

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[emgrav]

Very nice to have this done, thanks!