Fix ruff check issues

[mkitti]

• Used ruff check --fix
• Fix ruff check issues with pytest.warn

I ran ruff check --fix and then manually corrected lines it could not correct automatically.

TODO:

• Unit tests and/or doctests in docstrings
• Tests pass locally
• Docstrings and API docs for any new/modified user-facing classes and functions
• Changes documented in docs/release.rst
• Docs build locally
• GitHub Actions CI passes
• Test coverage to 100% (Codecov passes)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.96%. Comparing base (7a6fad3) to head (e8d10e5).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #764      +/-   ##
==========================================
- Coverage   99.96%   99.96%   -0.01%     
==========================================
  Files          64       64              
  Lines        2792     2789       -3     
==========================================
- Hits         2791     2788       -3     
  Misses          1        1              

Files with missing lines	Coverage Δ
numcodecs/abc.py	100.00% <100.00%> (ø)
numcodecs/checksum32.py	100.00% <100.00%> (ø)
numcodecs/lzma.py	100.00% <100.00%> (ø)
numcodecs/tests/test_zarr3.py	100.00% <100.00%> (ø)
numcodecs/zfpy.py	100.00% <100.00%> (ø)

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