Ensure rangesupdate event fires on all plots with linked axes

[philippjfr]

Fixes #5381

[codecov-commenter]

Codecov Report

Merging #5465 (d097a77) into master (e2f55d4) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #5465   +/-   ##
=======================================
  Coverage   88.12%   88.12%           
=======================================
  Files         301      301           
  Lines       62104    62108    +4     
=======================================
+ Hits        54730    54734    +4     
  Misses       7374     7374           

Impacted Files	Coverage Δ
holoviews/plotting/bokeh/callbacks.py	62.99% <100.00%> (+0.19%)	⬆️

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[philippjfr]

Will push a fix later.

[jlstevens]

Odd, there is the following error, but only on 3.9 ubuntu?!

    def test_poly_edit_callback(self):
        polys = Polygons([[(0, 0), (2, 2), (4, 0)]])
        poly_edit = PolyEdit(source=polys)
        plot = bokeh_server_renderer.get_plot(polys)
>       self.assertIsInstance(plot.callbacks[0], PolyEditCallback)
E       AssertionError: <holoviews.plotting.bokeh.callbacks.PolyDrawCallback object at 0x7efd2eb31340> is not an instance of <class 'holoviews.plotting.bokeh.callbacks.PolyEditCallback'>

[philippjfr]

Nothing to do with this PR, has been a transient for over a year now.

[jlstevens]

I was wondering if it was a transient but I never realized we had one that was an isinstance check failing. Very weird!

Anyway, merging.