bokeh 2.4.3 --> deprecation warning

[RomainWCSBx]

Describe the bug
with bokeh 2.4.3 :
'legend' keyword is deprecated, use explicit 'legend_label', 'legend_field', or 'legend_group' keywords instead

To Reproduce

import lantern as l
a = l.scatter()
l.plot(a, 'line', 'bokeh')

Expected behavior
No more deprecation warning (+stability with the upcoming versions of bokeh)

Screenshots
If applicable, add screenshots to help explain your problem.

Laptop:

• Python version : 3.8.13 | packaged by conda-forge | (default, Mar 25 2022, 06:04:10)
• IPython version : 8.4.0
• Tornado version : 6.1
• Bokeh version : 2.4.3
• BokehJS static path : /opt/conda/lib/python3.8/site-packages/bokeh/server/static
• node.js version : v16.12.0
• npm version : 8.1.0
• Operating system : Linux-5.10.124-linuxkit-x86_64-with-glibc2.10
• Browser : Chrome-104.0.5112.101