chore: migrate pytest config to version 9

[browniebroke]

Committed via https://github.com/asottile/all-repos

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.86%. Comparing base (e8c1abb) to head (cf024db).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1536   +/-   ##
=======================================
  Coverage   99.86%   99.86%           
=======================================
  Files          20       20           
  Lines         723      723           
  Branches       46       46           
=======================================
  Hits          722      722           
  Partials        1        1           

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