Mac CI is failing

[martinthomson]

We ask brew to do this:

brew install ninja mercurial cargo-binstall llvm

And for some reason, it tries to install PHP. And fails. Investigation needed.

[larseggert]

It's installing php because it's trying to upgrade dependencies of installed packages, and php is apparently one.

But that's not why it's failing, it's failing on

==> Pouring python@3.12--3.12.2.ventura.bottle.tar.gz
Error: The `brew link` step did not complete successfully
The formula built, but is not symlinked into /usr/local
Could not symlink bin/2to3-3.12
Target /usr/local/bin/2to3-3.12
already exists. You may want to remove it:
  rm '/usr/local/bin/2to3-3.12'

To force the link and overwrite all conflicting files:
  brew link --overwrite python@3.12

To list all files that would be deleted:
  brew link --overwrite --dry-run python@3.12

Possible conflicting files are:
/usr/local/bin/2to3-3.12 -> /Library/Frameworks/Python.framework/Versions/3.12/bin/2to3-3.12
/usr/local/bin/idle3.12 -> /Library/Frameworks/Python.framework/Versions/3.12/bin/idle3.12
/usr/local/bin/pydoc3.12 -> /Library/Frameworks/Python.framework/Versions/3.12/bin/pydoc3.12
/usr/local/bin/python3.12 -> /Library/Frameworks/Python.framework/Versions/3.12/bin/python3.12
/usr/local/bin/python3.12-config -> /Library/Frameworks/Python.framework/Versions/3.12/bin/python3.12-config

i.e., when trying to upgrade python.

[larseggert]

Also see actions/runner-images#4020

[larseggert]

It seems going to macos-14 fixes this. I will land the PR.