JupyterLab 4 support

[JasonWeill]

Problem

It is unclear whether this extension works with JupyterLab 4.

Proposed Solution

Test the extension with JupyterLab 4. If it works, update the documentation to say so. If it does not, update the code for compatibility with Lab 4.

Additional context

See also jupyterlab/jupyterlab-git#1245, jupyterlab/jupyter-ai#173, and jupyter-server/jupyter-scheduler#380 for Lab 4 support.

[welcome]

Thank you for opening your first issue in this project! Engagement like this is essential for open source projects! 🤗

If you haven't done so already, check out Jupyter's Code of Conduct. Also, please try to follow the issue template as it helps other other community members to contribute more effectively.

You can meet the other Jovyans by joining our Discourse forum. There is also an intro thread there where you can stop by and say Hi! 👋

Welcome to the Jupyter community! 🎉