Don't parameterize tests using non-Collection iterables

[cjwatson]

This is deprecated as of pytest 9.1; see
https://docs.pytest.org/en/stable/deprecations.html#non-collection-iterables-in-pytest-mark-parametrize.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.29%. Comparing base (2d985e7) to head (f5c39f6).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #731      +/-   ##
==========================================
+ Coverage   89.27%   89.29%   +0.02%     
==========================================
  Files          40       40              
  Lines        4821     4821              
==========================================
+ Hits         4304     4305       +1     
+ Misses        517      516       -1     

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