Fix lint errors

[timkpaine]

Updates code for the latest Ruff diagnostics without changing lint configuration. make lint passes.

[github-actions]

Test Results

12 tests  ±0   10 ✅ ±0   0s ⏱️ ±0s
 1 suites ±0    2 💤 ±0 
 1 files   ±0    0 ❌ ±0 

Results for commit 223c628. ± Comparison against base commit a8b49ff.

[codecov]

Codecov Report

❌ Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 85.35%. Comparing base (a8b49ff) to head (223c628).

Files with missing lines	Patch %	Lines
fsspec_python/importer.py	83.33%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #35   +/-   ##
=======================================
  Coverage   85.35%   85.35%           
=======================================
  Files           5        5           
  Lines         157      157           
  Branches       27       27           
=======================================
  Hits          134      134           
  Misses         12       12           
  Partials       11       11           

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