Update to JupyterLab 4 and Notebook 7

[jtpio]

Fixes #1095

Changes

• Update the base environment to JupyterLab 4 and Notebook 7
• Update to Jupyter Server 2
• Do not update Python 3.7 in freeze.py because these new versions dropped support for Python 3.7
• Update to jupyter-nbclassic-nbextension commands
• Update jupyter-resource-usage to 1.0

[jtpio]

Looks like a failure is related to nbgitpuller importing notebook.utils which does not exist in Notebook 7:

[jtpio]

Looks like jupyterhub/nbgitpuller#240 should help with this.

[yuvipanda]

@jtpio think you'll have any time to push this forward?

[jtpio]

It was paused because of the two failing tests. Maybe they will pass after a fresh rebase.

[yuvipanda]

Hmm, the failures look real:

Jupyter command `jupyter-nbextension` not found.

Thoughts on splitting up the upgrade to jupyterlab 4 from notebook 7? I think the jupyterlab 4 change is uncontroversial and easy. But for notebook 7, we have to figure out what to do about nbclassic, and it's a bit more of a breaking change.

[jtpio]

Right doing the JupyterLab 4 update separately would be fine.

I just pushed a commit to fix a reference to jupyter-nbextension. The update to Notebook 7 would indeed break the use of jupyter-nbextension because it is now available as jupyter-nbclassic-nbextension instead.

[jtpio]

Right doing the JupyterLab 4 update separately would be fine.

Opened #1340.