Dreamhost may or may not be very responsive to your request. I chose to do the update myself, in the interest of maximizing security. If you are of the same mindset, the update is very simple. Go to Joomla.org, download the update package and expand it. Next ftp the updated files over your existing directory structure, check out the readme file, and you’ll be updated.
Obviously this isn’t the same thing you requested, but you will be safer if you take the update into your own hands. There is an FAQ at Joomla’s site.