chore(ci): Apply Repo-Review suggestions [ruff]

[DimitriPapadopoulos]

Apply all suggestions related to ruff:

https://learn.scientific-python.org/development/guides/repo-review/?repo=bids-standard%2Fpython-validator&ref=HEAD&refType=branch

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.89%. Comparing base (2268770) to head (f2eedf1).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #57   +/-   ##
=======================================
  Coverage   90.89%   90.89%           
=======================================
  Files          13       13           
  Lines         846      846           
  Branches      124      124           
=======================================
  Hits          769      769           
  Misses         47       47           
  Partials       30       30           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.