mac-xcode ci is failing consistently

[NQNStudios]

This regression coincided with upgrading the MacOS runners that we use, which is frustrating because that PR had shown the CI passing when I first submitted it.

[NQNStudios]

Oh-- I think this and #528 are both caused by homebrew updating the formula for sfml to deliver version 3.0.0. I hope there is a legacy formula we can use that will keep providing the latest 2.x

[NQNStudios]

Wait... this is weird, install-sfml.sh literally downloads from a direct link to the right version, which should be good, but the prior step installs SFML from brew, and that version is used instead. Will it work if I just remove SFML from the brew install step?

[NQNStudios]

Oh I'm quite mixed up here. The Xcode build calls install-sfml.sh but the Scons build does not. So the Xcode build is failing even though it has the expected version of SFML