Pin task-collection pip to <24.1?

[tcompa]

As of pip v24.1, the scmultiplex task package cannot be installed (ref fmi-basel/gliberal-scMultipleX#106).

Note that task collection always runs pip install --upgrade pip before installing a package, which means that any task-collection of that package taking place now will likely fail, even without a version update of fractal-server.

The specific issue is related to using the 1.4 prefect version, which has some old-style metadata which are now deprecated as of pip=24.1 (see https://pip.pypa.io/en/stable/news/#deprecations-and-removals and pypa/pip#12063). I don't know whether other task packages are affected.

I have no idea of how complex it would be to fix the specific scmultiplex issue, but for the moment the only fractal-side fix is to constrain the task-collection pip to <24.1.

[tcompa]

As of the call this afternoon:
Let's cap this to <= FRACTAL_MAX_PIP_VERSION, and start with FRACTAL_MAX_PIP_VERSION=24.0

The goal is not only to fix the scmultiplex use case (which can also be fixed in other ways), but also to provide a bit more stability.

[tcompa]

This change has to happen twice, in the standard and ssh task collection