build: fix build scripts on macOS (#33843)

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

scripts/package-builder.sh

@@ -16,7 +16,7 @@ set -u -e -o pipefail
 cd "$(dirname "$0")"
 
 # basedir is the workspace root
-readonly base_dir="$(realpath "$(pwd)/..")"
+readonly base_dir="$(dirname "$(pwd)")"
 readonly bazel_bin="$(yarn run -s bazel info bazel-bin)"
 readonly script_path="$0"