Fix overlaying labels with sankey (#5864) #1447

Job	Run time
Run pre-commit hooks	25s
UI tests on ubuntu-latest with Python 3.9	6m 15s
Pytest on 3.8, Bokeh 2, ubuntu-latest	30m 49s
Pytest on 3.8, Bokeh 3, ubuntu-latest	42m 21s
Pytest on 3.11, Bokeh 2, ubuntu-latest	34m 44s
Pytest on 3.11, Bokeh 3, ubuntu-latest	32m 12s
Pytest on 3.8, Bokeh 2, macos-latest	52m 15s
Pytest on 3.8, Bokeh 3, macos-latest	1h 0m 9s
Pytest on 3.11, Bokeh 2, macos-latest	50m 52s
Pytest on 3.11, Bokeh 3, macos-latest	56m 24s
Pytest on 3.8, Bokeh 2, windows-latest	58m 47s
Pytest on 3.8, Bokeh 3, windows-latest	1h 9m 54s
Pytest on 3.11, Bokeh 2, windows-latest	1h 7m 28s
Pytest on 3.11, Bokeh 3, windows-latest	1h 4m 11s
	10h 26m 46s

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