Fix errors from new ruff

[timkpaine]

Description

Brief description of the changes in this PR.

Type of Change

• Bug fix
• New feature
• Documentation update
• Refactor / code cleanup
• CI / build configuration
• Other (describe below)

Checklist

• Linting passes (make lint)
• Tests pass (make test)
• New tests added for new functionality
• Documentation updated (if applicable)
• Changelog / version bump (if applicable)

[github-actions]

Test Results

    1 files  ±0      1 suites  ±0   3m 15s ⏱️ +19s
1 309 tests ±0  1 307 ✅ ±0  2 💤 ±0  0 ❌ ±0 
1 315 runs  ±0  1 313 ✅ ±0  2 💤 ±0  0 ❌ ±0 

Results for commit 709a36e. ± Comparison against base commit 30e2858.

♻️ This comment has been updated with latest results.

[codecov]

Codecov Report

❌ Patch coverage is 97.08384% with 24 lines in your changes missing coverage. Please review.
✅ Project coverage is 93.27%. Comparing base (30e2858) to head (709a36e).

Files with missing lines	Patch %	Lines
ccflow/tests/test_base_cloudpickle.py	0.00%	7 Missing ⚠️
ccflow/arrow.py	76.92%	2 Missing and 1 partial ⚠️
ccflow/flow_model.py	97.85%	3 Missing ⚠️
ccflow/pickling.py	66.66%	2 Missing ⚠️
ccflow/tests/evaluators/test_common.py	96.36%	2 Missing ⚠️
ccflow/callable.py	97.77%	1 Missing ⚠️
ccflow/context.py	85.71%	0 Missing and 1 partial ⚠️
ccflow/exttypes/arrow.py	87.50%	1 Missing ⚠️
ccflow/exttypes/narwhals.py	90.00%	1 Missing ⚠️
ccflow/publishers/composite.py	85.71%	1 Missing ⚠️
... and 2 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #250      +/-   ##
==========================================
- Coverage   93.27%   93.27%   -0.01%     
==========================================
  Files         176      176              
  Lines       19864    19840      -24     
  Branches     1283     1279       -4     
==========================================
- Hits        18529    18506      -23     
+ Misses       1095     1094       -1     
  Partials      240      240              

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