Allow notebooks to run under Julia 1.6

[ablaom]

I may misunderstand, but my julia Project.toml file states `julia = ">=1.6, <1.7" but the build process is launching 1.5 and crashing.

Julia 1.6 is already in its third patch release 1.6.3. Also, code loading/compilation in julia 1.6 is way faster.

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[exaexa]

Hello!
I'd welcome running julia 1.6 kernels in Binder too. Is there any best way to help it? (I guess I could at least help making the container or something)

[manics]

This needs to be done in https://github.com/jupyterhub/repo2docker which is the tool underlying BinderHub. I'll transfer the issue to that repo.

Julia is handled here:
https://github.com/jupyterhub/repo2docker/tree/main/repo2docker/buildpacks/julia

[exaexa]

Oh nice, thanks.

Actually, I figured that Julia 1.6 is supported (the official clicky example on binder website for julia spawns julia 1.6.2 kernel!), but if I write julia version 1.6 into the .ipynb file, it doesn't open that saying that the kernel does not exist.

Notably, the example specifies julia-1.1 but actually gets Julia 1.6.2.

So perhaps just updating the version numbers somewhere here would fix the whole problem?

[manics]

I'm afraid I don't know enough about Julia. If you or someone else figures out what change is needed please add a test to ensure its not inadvertently broken in future!

[ablaom]

@davidanthoff Any chance you could take a look at this?