Update to ruff 0.16.x, make required fixes

[chrisjonesBSU]

ruff (used by precommit) recently updated from 0.15.x to 0.16.x, which cause quite a bit of errors. This PR cleans those up.

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[codecov]

Codecov Report

❌ Patch coverage is 78.57143% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 95.01%. Comparing base (4a1bb72) to head (7315d22).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
grits/finegrain.py	60.00%	2 Missing ⚠️
grits/utils.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #132      +/-   ##
==========================================
+ Coverage   94.98%   95.01%   +0.02%     
==========================================
  Files           4        4              
  Lines         459      461       +2     
==========================================
+ Hits          436      438       +2     
  Misses         23       23              

Files with missing lines	Coverage Δ
grits/__init__.py	77.77% <ø> (ø)
grits/coarsegrain.py	95.94% <100.00%> (ø)
grits/utils.py	97.52% <75.00%> (+0.04%)	⬆️
grits/finegrain.py	88.33% <60.00%> (ø)

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