Jupyter - fix retrieve_nb_from_cache regression

[cscheid]

Closes #9618.

[cscheid]

@cderv I'll need some help from you in setting up those Pipfile and Pipfile.lock files. I changed the Pipfile but my attempt to PIPENV_IGNORE_VIRTUALENVS=1 pipenv install jupyter_cache ended up with a totally different Pipfile.lock.

[cderv]

ended up with a totally different Pipfile.lock.

I don't know how different it was. Running pipenv install will re-lock from the PipFile - this means that everything will be resolved again to latest as we don't pinned version that much (using "*" for all our deps).

So the Pipfile.lock will end up different as everything could be updated. Running pipenv update jupyter-cache can have less impact and it should only tweak the dependencies from the package and do not resolved the rest.

I did that here, let's see if this works ok. There could be some OS tweak unfortunately as Python dependencies management is bad cross-OS. I'll handle windows, but you should check on Mac maybe