Fix typing in cliLogTestBase.

[dhirving]

Cherry-pick Jim's fix for the latest mypy breakage to main, since it's needed on other branches.

Checklist

• ran Jenkins
• added a release note for user-visible changes to doc/changes
• (if changing dimensions.yaml) make a copy of dimensions.yaml in configs/old_dimensions

[codecov]

Codecov Report

Attention: Patch coverage is 44.44444% with 5 lines in your changes missing coverage. Please review.

Project coverage is 89.73%. Comparing base (86eadf3) to head (4a9cb03).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
python/lsst/daf/butler/tests/cliLogTestBase.py	44.44%	4 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1097      +/-   ##
==========================================
- Coverage   89.73%   89.73%   -0.01%     
==========================================
  Files         361      361              
  Lines       47319    47324       +5     
  Branches     5767     5709      -58     
==========================================
+ Hits        42462    42466       +4     
- Misses       3502     3506       +4     
+ Partials     1355     1352       -3     

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