fix(tests): make fs2 testing compatible with recent versions of click

[joanise]

See EveryVoiceTTS/EveryVoice#787

[semanticdiff-com]

Review changes with  

Changed Files

File	Status
fs2/model.py	15% smaller
.github/workflows/test.yml	13% smaller
fs2/tests/test_cli.py	0% smaller

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 49.69%. Comparing base (46d09ab) to head (2fd127b).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #136   +/-   ##
=======================================
  Coverage   49.69%   49.69%           
=======================================
  Files          27       27           
  Lines        1988     1988           
=======================================
  Hits          988      988           
  Misses       1000     1000           

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