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

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https://hg.mozilla.org/integration/gaia-2_0/rev/e8253a9cf899
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1034202 - [Vertical] Intermittent failing test, Vertical Home - Packaged App Update resume update r=me
Bumping manifests a=b2g-bump