Support old pytests

[iurisilvio]

Fix #11

[codecov]

Codecov Report

Attention: Patch coverage is 90.90909% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 89.13%. Comparing base (463bb48) to head (fb2243f).

Files	Patch %	Lines
pytest_ruff/__init__.py	66.66%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #13      +/-   ##
==========================================
+ Coverage   86.23%   89.13%   +2.89%     
==========================================
  Files           4        5       +1     
  Lines         109      138      +29     
  Branches       16       17       +1     
==========================================
+ Hits           94      123      +29     
- Misses          6        7       +1     
+ Partials        9        8       -1     

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