[CI] Update to use new mac bootstrapper
[CI] Update to use new mac bootstrapper

See https://github.com/habitat-sh/mac-bootstrapper/pull/19

Signed-off-by: Christopher Maier <b4598f17a90ef80817bae8ad6c37249740caafb4@chef.io>

habitat-sh/habitat,habitat-sh/habitat,habitat-sh/habitat,habitat-sh/habitat,habitat-sh/habitat,habitat-sh/habitat,habitat-sh/habitat,habitat-sh/habitat