Support JupyterLab 4, Notebook 7

[bollwyvl]

Is your feature request related to a problem? Please describe.

This package doesn't have an upper bound on its jupyterlab, but also doesn't support JupyterLab 4

Describe the solution you'd like

a new release line that only supports JupyterLab 4/Notebook 7

Describe alternatives you've considered

a release that supports JupyterLab 3 and JupyterLab 4 and Notebook 7. This is probably harder.

Additional context

It would be nice to get #29 into it, but wouldn't strictly be blocking.

[jtpio]

Closing as this seems to have been fixed by #75, #71, and released in https://github.com/jupyterlab-contrib/jupyterlab-tour/releases/tag/v4.0.0.

[jtpio]

While it might be working in JupyterLab 4 and Notebook 7, looks like we lost JupyterLite support on the way: #81 (comment)

[jtpio]

Opened #82