In #33823, `scripts/package-builds.sh` (which is used by both
`build-packages-dist.sh` and `build-ivy-npm-packages.sh`) was updated to
use `realpath`. It turns out that `realpath` does not exist on macOS, so
the build scripts do not work there.
This commit fixes it by switching from `realpath $(pwd)/..` to
`dirname $(pwd)`, which does practically the same thing (in this
situation) and works on macOS as well.
PR Close#33843