Enable failing visualisation test

[rob-luke]

@larsoner do you know how to fix the errors being thrown in the github actions here? It seems to be related to https://github.com/mne-tools/mne-python/pull/11129, but I don't want to require MNE main. Thanks

[codecov[bot]]

Codecov Report

Merging #481 (a84ee4d) into main (92a17b3) will increase coverage by 3.31%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #481      +/-   ##
==========================================
+ Coverage   92.64%   95.96%   +3.31%     
==========================================
  Files          65       65              
  Lines        2653     2676      +23     
  Branches      391      397       +6     
==========================================
+ Hits         2458     2568     +110     
+ Misses        139       51      -88     
- Partials       56       57       +1     

Impacted Files	Coverage Δ
mne_nirs/tests/test_examples.py	81.25% <100.00%> (+0.60%)	:arrow_up:
mne_nirs/visualisation/tests/test_visualisation.py	100.00% <100.00%> (ø)
mne_nirs/preprocessing/_mayer.py	98.00% <0.00%> (+2.00%)	:arrow_up:
mne_nirs/visualisation/_plot_3d_montage.py	98.03% <0.00%> (+84.31%)	:arrow_up:

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[larsoner]

/opt/hostedtoolcache/Python/3.10.6/x64/lib/python3.10/site-packages/mne/viz/backends/_pyvista.py:1097: in _close_3d_figure
    del _ALL_PLOTTERS[plotter._id_name]
E   KeyError: '0x7f75563cb370-0'

this is on the failing (dev) build but this line has been fixed upstream

https://github.com/mne-tools/mne-python/blob/c87ed30fa8126a9ca8f47066cdd98cacbfb38e32/mne/viz/backends/_pyvista.py#L1097

[larsoner]

FYI I added branch protection rules for main and enabled auto-squash-and-merge so now there is a button you can click to "squash and merge when green" @rob-luke

[rob-luke]

This is amazing! Thanks @larsoner