Use latest react-grid from CDN

[philippjfr]

Fixes #3565

[codecov]

Codecov Report

Merging #4461 (9ac7c10) into main (72049e0) will decrease coverage by 8.17%.
The diff coverage is n/a.

❗ Current head 9ac7c10 differs from pull request most recent head a0427d3. Consider uploading reports for the commit a0427d3 to get more accurate results

@@            Coverage Diff             @@
##             main    #4461      +/-   ##
==========================================
- Coverage   81.78%   73.61%   -8.17%     
==========================================
  Files         243      243              
  Lines       35234    35234              
==========================================
- Hits        28815    25938    -2877     
- Misses       6419     9296    +2877     

Flag	Coverage Δ
ui-tests	?
unitexamples-tests	73.61% <ø> (ø)

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Impacted Files	Coverage Δ
panel/template/react/__init__.py	100.00% <ø> (ø)
panel/tests/ui/widgets/test_tabulator.py	9.51% <0.00%> (-88.71%)	⬇️
panel/tests/ui/widgets/test_input.py	11.34% <0.00%> (-88.13%)	⬇️
panel/tests/ui/layout/test_accordion.py	14.72% <0.00%> (-85.28%)	⬇️
panel/tests/ui/widgets/test_sliders.py	15.42% <0.00%> (-84.58%)	⬇️
panel/tests/ui/layout/test_card.py	18.48% <0.00%> (-81.52%)	⬇️
panel/tests/ui/pane/test_image.py	25.80% <0.00%> (-74.20%)	⬇️
panel/tests/ui/test_reactive.py	26.53% <0.00%> (-73.47%)	⬇️
panel/tests/ui/pane/test_markup.py	28.00% <0.00%> (-72.00%)	⬇️
panel/tests/ui/template/test_fastgridtemplate.py	28.57% <0.00%> (-71.43%)	⬇️
... and 29 more

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