Fix macOS CI runner

[singiamtel]

Something changed in the default GitHub runners image again, and broke our setup

actions/runner-images#10984

Error logs:

Error: The `brew link` step did not complete successfully
The formula built, but is not symlinked into /opt/homebrew
Could not symlink bin/pkg-config
Target /opt/homebrew/bin/pkg-config
is a symlink belonging to pkg-config@0.29.2. You can unlink it:
  brew unlink pkg-config@0.29.2

To force the link and overwrite all conflicting files:
  brew link --overwrite pkgconf

To list all files that would be deleted:
  brew link --overwrite pkgconf --dry-run

Possible conflicting files are:
/opt/homebrew/bin/pkg-config -> /opt/homebrew/Cellar/pkg-config@0.29.2/0.29.2_3/bin/pkg-config
/opt/homebrew/share/aclocal/pkg.m4 -> /opt/homebrew/Cellar/pkg-config@0.29.2/0.29.2_3/share/aclocal/pkg.m4
/opt/homebrew/share/man/man1/pkg-config.1 -> /opt/homebrew/Cellar/pkg-config@0.29.2/0.29.2_3/share/man/man1/pkg-config.1