Update TOPMed recipe to download from bucket.
Update TOPMed recipe to download from bucket.

It takes a long time to prep this, so it is better to just prep it once
and download it. We can revisit if this ends up eating a bunch of money.

chapmanb/cloudbiolinux,chapmanb/cloudbiolinux,chapmanb/cloudbiolinux,chapmanb/cloudbiolinux