Bumping gaia.json for 1 gaia revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-2_0/rev/ac7d9c7c2438
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1031130 - Intermittent failing test, Vertical Home - Packaged App Update update an installed app r=me
Bumping manifests a=b2g-bump