Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/7dbce5ade723
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #20773 from KevinGrandon/bug_1018708_reland

Bug 1018708 - Collection localizations for homescreen + add localizations to shared

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https://hg.mozilla.org/integration/gaia-central/rev/ba87e2fc0ad8
Author: James Lal <james@lightsofapollo.com>
Desc: Bug 1018708 - Collection localizations for homescreen + add localizations to shared r=kgrandon
Bumping manifests a=b2g-bump