Update to JupyterLab 4

[jtpio]

Fixes #31 Fixes #54 Fixes #57 Closes https://github.com/jupyterlab-contrib/jupyterlab-filesystem-access/pull/32

• [x] Bootstrap the update with the update script: https://jupyterlab.readthedocs.io/en/latest/extension/extension_migration.html#upgrading-extension-using-the-upgrade-script
• [x] Enable toolbar items

[jtpio]

Looking good at first:

Some dev tools errors that might be related to the update:

[jtpio]

While the current JupyterLite version seems to be working fine accessing files from the kernel:

Using this branch with the latest jupyterlite-*packages gives the following error:

[jtpio]

Checking with jupyterlite-pyodide-kernel==0.2.0a2, jupyterlite-core==0.2.0rc1 and the current version of jupyterlab-filesystem-access (0.5.3, the extension is built against JupyterLab 3 but activates fine in JupyterLab 4):

So this might be more of an issue with the latest jupyterlite-* packages when accessing drive content from the kernel, than an issue with this PR updating to JupyterLab 4.

[jtpio]

Hopefully this will be fixed in https://github.com/jupyterlite/jupyterlite/pull/1227.

[jtpio]

Getting this one in to follow-up with https://github.com/jupyterlab-contrib/jupyterlab-filesystem-access/issues/58.

[martinRenou]

Great thanks!