[SCSB-225] migrate [tool.pytest.ini_options] to native TOML

[zacharyburnett]

Resolves SCSB-225

Pytest 9.0 includes a native TOML table [tool.pytest], which we should use instead of [tool.pytest.ini_options]

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.22%. Comparing base (e384f70) to head (ae526de).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #212   +/-   ##
=======================================
  Coverage   97.22%   97.22%           
=======================================
  Files           2        2           
  Lines         361      361           
=======================================
  Hits          351      351           
  Misses         10       10           

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