Bugbear lint

[Hoxbro]

Updates to codebase with Bugbear running: ruff holoviews --select=B --ignore=B006,B904,B015,B018.

For now, I have not enabled it by default.

Running the command will still give the following errors:

❯ ruff holoviews --select=B --ignore=B006,B904,B015,B018 
holoviews/plotting/util.py:226:17: B007 Loop control variable `v` not used within loop body
holoviews/plotting/util.py:233:21: B007 Loop control variable `v` not used within loop body
holoviews/tests/plotting/matplotlib/test_graphplot.py:209:13: B017 `assertRaises(Exception)` should be considered evil
holoviews/tests/plotting/matplotlib/test_graphplot.py:403:13: B017 `assertRaises(Exception)` should be considered evil
holoviews/util/command.py:60:25: B008 Do not perform function call `OptsMagicProcessor` in argument defaults
holoviews/util/command.py:61:25: B008 Do not perform function call `OutputMagicProcessor` in argument defaults
holoviews/util/command.py:62:25: B008 Do not perform function call `StripMagicsProcessor` in argument defaults
Found 7 errors.

[codecov-commenter]

Codecov Report

Merging #5768 (ff4ddd0) into main (14d7d9d) will decrease coverage by 0.01%.
The diff coverage is 94.92%.

@@            Coverage Diff             @@
##             main    #5768      +/-   ##
==========================================
- Coverage   88.18%   88.18%   -0.01%     
==========================================
  Files         306      306              
  Lines       62739    62812      +73     
==========================================
+ Hits        55326    55390      +64     
- Misses       7413     7422       +9     

Impacted Files	Coverage Δ
holoviews/plotting/bokeh/annotation.py	85.14% <0.00%> (ø)
holoviews/plotting/bokeh/util.py	66.92% <0.00%> (ø)
holoviews/core/boundingregion.py	62.58% <33.33%> (-0.82%)	⬇️
holoviews/core/data/__init__.py	86.53% <100.00%> (ø)
holoviews/core/data/dask.py	90.00% <100.00%> (ø)
holoviews/core/data/grid.py	86.27% <100.00%> (ø)
holoviews/core/data/spatialpandas.py	87.46% <100.00%> (ø)
holoviews/core/data/util.py	58.92% <100.00%> (ø)
holoviews/core/dimension.py	86.77% <100.00%> (ø)
holoviews/core/options.py	82.53% <100.00%> (+0.10%)	⬆️
... and 32 more

... and 4 files with indirect coverage changes

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[maximlt]

I didn't know bugbear, for reference this is originally a flake8 plugin that was re-implemented by ruff. Some of the changes made by the tools look dubious to me, I think it's worth reviewing it in details before merging.