Bumping gaia.json for 2 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/76f431dd5fff
Author: James Burke <jrburke@gmail.com>
Desc: Merge pull request #10614 from jrburke/bug886446-email-partition

Bug 886446 - [email] Partition card loading, cache initial card HTML for fast startup r=asuth

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https://hg.mozilla.org/integration/gaia-central/rev/0bfac4c5f317
Author: jrburke <jrburke@gmail.com>
Desc: Bug 886446 - [email] Partition card loading, cache initial card HTML for fast startup