Update url in setup.py

[rcthomas]

The homepage link on the PyPI project page for jupyterlab-hdf points to this fork of the jupyterlab-hdf5 GitHub repo, not the repo in the JupyterLab org. I think maybe this just hasn't been updated? Thanks.

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[github-actions]

👈 Launch a binder notebook on branch rcthomas/jupyterlab-hdf5/url-update

[rcthomas]

Originally this PR was just going to fix a package metadata issue. But to make all the checks pass I had to make two additional commits that would be out of place for a PR that's just fixing package metadata. One approach would be to redirect this PR (or consider it) to be a more general "upkeep" PR, but discussion is still needed:

The additional commits upgrade the Node requirement for the build checks, which fail without that change; and requires Notebook <7 so that the test checks pass. I don't know whether jupyterlab-hdf5 works in practice with Notebook v7 or not, but if so the tests need to be rewritten to not depend on notebook.utils which doesn't seem to be provided by Notebook v7. If no one is in a position to revise those tests, and since are no passing tests here for v7, it may make sense to make notebook<7 a requirement until that's addressed.

[loichuder]

Thanks for fixing the build issues ! I was going to have a look but you beat me to it 🚀

I have no problem merging your PR as it is. It simply moved from URL fixing to more general housekeeping.

In my opinion, notebook<7 is the way to go for now since the tests were written before Notebook 7 was a thing.

[rcthomas]

OK. I think these fixes may also address the other 2 outstanding PRs

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