Fix ruff invocation in tox

[dekkers]

Description

Fixes the following error when running ruff with tox:

ruff <path> has been removed. Use ruff check <path> instead.

How Has This Been Tested?

Running tox -e ruff.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.72%. Comparing base (3b42dc8) to head (42cf133).
Report is 8 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #728      +/-   ##
==========================================
- Coverage   97.84%   97.72%   -0.12%     
==========================================
  Files          78       78              
  Lines        3390     3435      +45     
  Branches      384      394      +10     
==========================================
+ Hits         3317     3357      +40     
- Misses         42       46       +4     
- Partials       31       32       +1     

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[claudep]

Fine, thanks!