[CI/Github Actions] Fair number of transitory errors with pip install on OSX (

[valeriupredoi]

This example that's started to flake about rather often, not only seen here, but in other packages as well, with a slightly different form. This is pip=24.0 but it could easily be a persisting bad connection to the GH server - if the lack of git is actual ie the executable really is missing (see pypa/setuptools-scm#278) then we are faced with GH-GA nodes that don't have git which is a bummer, so we'll have to install our own git on them. I'll keep an eye on these - if they still keep popping up, I'll plop a apt-get update && apt-get install git --assume-yes on OSX