Fix overlaying labels with sankey

[ahuang11]

Not sure if this fixes the root of the problem or is simply a bandaid, but fixes #5863

import holoviews as hv
from holoviews import opts, dim
hv.extension('bokeh')
import numpy as np


nodes = ["PhD", "Career Outside Science",  "Early Career Researcher", "Research Staff",
         "Permanent Research Staff",  "Professor",  "Non-Academic Research"]
nodes = hv.Dataset(enumerate(nodes), 'index', 'label')
edges = [
    (0, 1, 53), (0, 2, 47), (2, 6, 17), (2, 3, 30), (3, 1, 22.5), (3, 4, 3.5), (3, 6, 4.), (4, 5, 0.45)   
]

value_dim = hv.Dimension('Percentage', unit='%')
careers = hv.Sankey((edges, nodes), ['From', 'To'], vdims=value_dim)
labels = hv.Labels(([0, 1, 2, 3], [6, 6, 6, 6], ["A", "B", "C", "D"]), kdims=["From", "To"])

labels * careers

[codecov-commenter]

Codecov Report

Merging #5864 (7c508f2) into main (e2f06d0) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #5864   +/-   ##
=======================================
  Coverage   88.36%   88.36%           
=======================================
  Files         310      310           
  Lines       63950    63950           
=======================================
  Hits        56512    56512           
  Misses       7438     7438           

Flag	Coverage Δ
ui-tests	23.40% <0.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
holoviews/plotting/bokeh/element.py	88.06% <100.00%> (ø)

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[github-actions]

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