Update Tabulator to 6.2.1

[hoxbro]

Supersede #6478

selectable -> selectableRows in https://tabulator.info/docs/5.6/upgrade#selection

I don't plan to expose any new functionality in this PR. This can be done in follow-up PRs.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 46.66667% with 8 lines in your changes are missing coverage. Please review.

Project coverage is 81.50%. Comparing base (7377c9e) to head (4ac5f0c). Report is 4 commits behind head on main.

Files	Patch %	Lines
panel/compiler.py	11.11%	8 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6840      +/-   ##
==========================================
- Coverage   81.51%   81.50%   -0.02%     
==========================================
  Files         318      318              
  Lines       46709    46722      +13     
==========================================
+ Hits        38076    38079       +3     
- Misses       8633     8643      +10     

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[hoxbro]

The failing UI tests are because of this upstream issue: https://github.com/olifolkerd/tabulator/issues/4421

import panel as pn
import pandas as pd

pn.extension('tabulator')

df = pd.DataFrame({'A': [1, 2, 3], 'B': [4, 5, 6]})

pn.widgets.Tabulator(df, disabled=True).servable()