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

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https://hg.mozilla.org/integration/gaia-2_0/rev/8e9f5541ad69
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1030452 - Intermittent failing test, Vertical Home - Packaged App Install install app
Bumping manifests a=b2g-bump