Make tljh_extra_hub_pip_packages hook match pyproject.toml

[TimoRoth]

I was wondering why even a new install ends up with a really old version of this.
That hook is probably why.

[trungleduc]

Hi, thank you for your contribution. Do the tests pass locally for you?

[TimoRoth]

So far I didn't run them, since the change seemed somewhat trivial.
I have manually updated dockerspawner on our hub env though and there are no obvious issues so far.

[TimoRoth]

The test failure looks genuine. But it's not a change in the docker python modules, but a change by the docker engine itself.
Compare https://docs.docker.com/reference/api/engine/version/v1.26/#tag/Image/operation/ImageInspect with https://docs.docker.com/reference/api/engine/version/v1.47/#tag/Image/operation/ImageInspect
The ContainerConfig item was renamed to just Config it seems.

[TimoRoth]

Turns out the code itself already deals with this change: https://github.com/plasmabio/tljh-repo2docker/blob/master/tljh_repo2docker/__init__.py#L137
It's just the tests that don't.