ipywidgets can't be installed

[cmcaine]

%pip install ipywidgets
...
ValueError: Can't find a pure Python 3 wheel for 'widgetsnbextension~=4.0.12'.

This is fixed in newer versions of pyodide-kernel. See e.g. jupyterlite/pyodide-kernel#135

The fix they have there of bumping the requirements may work for the version of pyodide-kernel that we're using as well, if updating pyodide-kernel itself is too much change.

[rgon]

I implemented a fix in #9, give it a look! Edit: couldn't get it to work more than once. If anyone has issues with the current one and need a quick fix, I published an update rewrite in @rgon/grist-jupyterlite-2