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

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https://hg.mozilla.org/integration/gaia-central/rev/d83630d272b1
Author: Jared Hirsch <ohai@6a68.net>
Desc: Merge pull request #20042 from 6a68/bug-998012-tos-pp

Bug 998012 - Add FxA Terms/Privacy text to the system app

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https://hg.mozilla.org/integration/gaia-central/rev/a7fb8b24440f
Author: Jared Hirsch <ohai@6a68.net>
Desc: Bug 998012 - Add FxA Terms/Privacy text to the system app r=alive
Bumping manifests a=b2g-bump