[bug#39765] Add package JupyterLab

[Lars-Dominik Braun]

Hi Ludo,

> (It’s not about what I personally want or don’t want, of course.  :-))
> In general, the guideline is to have patches that are either included
> upstream, just not in a published release, or are Guix-specific and thus
> are not meant to be included upstream.
>
> This patch doesn’t seem to fall in any of these two categories, so I
> would prefer not to have it, at least not until upstream has included
> it.
sure, I can see that :)

Lars