Update to JupyterLab 4.1

[jtpio]

It would be useful to open a draft PR that updates to the JupyterLab 4.1 pre-release.

To make sure we can catch potential upstream issues early and fix them before the final 4.1 release.

Other relevant items for this update:

• Notebook 7.0.0 ignores kernel's help_links property #6963
• Feature Request: Mermaid Support #6902