Update to JupyterLab 4.0.0a32

[jtpio]

Fixes #6637
Fixes #6633
Fixes #6567

To check

• Depend on @jupyter/ydoc instead of @jupyter-notebook/ydoc: Depend on @jupyter/ydoc instead of @jupyter-notebook/ydoc jupyterlab/jupyterlab#13506
• Fix syntax highlighting for JSON viewer in Jupyter Notebook jupyterlab/jupyterlab#13470
• [4.0.0a31 / 3.6.0a4] Icons are not properly rendered with custom themes jupyterlab/jupyterlab#13461
• Update to Playwright 1.29 jupyterlab/jupyterlab#13612
• Bump to Jest 29 jupyterlab/jupyterlab#12584
• Move the toggle file browser logic to the widget jupyterlab/jupyterlab#13466
• Update plugin ID of hub extension jupyterlab/jupyterlab#13688
• Update to the latest Lumino 2 pre-release
• Other changes from https://github.com/jupyterlab/jupyterlab/releases/tag/v4.0.0a32
• Update UI tests snapshots

[github-actions]

👈 Launch a Binder on branch jtpio/notebook/update-lab-alpha-32

[jtpio]

• Fix syntax highlighting for JSON viewer in Jupyter Notebook jupyterlab/jupyterlab#13470

Maybe a background style is missing, but looking better:

• [4.0.0a31 / 3.6.0a4] Icons are not properly rendered with custom themes jupyterlab/jupyterlab#13461

Looking good now ✔️

[jtpio]

Now looking good on Binder.

Will be proceeding with a new pre-release right after.