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

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https://hg.mozilla.org/integration/gaia-central/rev/812248d08775
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #18320 from viorelaioia/bug_995992

Bug 995992 - New screen has been added to the FTU ui

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https://hg.mozilla.org/integration/gaia-central/rev/ee7f712d48e6
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: Bug 995992 - New screen has been added to the FTU ui
Bumping manifests a=b2g-bump