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

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https://hg.mozilla.org/integration/gaia-central/rev/81596532ed5a
Author: Jared Hirsch <ohai@6a68.net>
Desc: Merge pull request #17675 from 6a68/bug-987419-fxa-fte-copy-update

Bug 987419 fxa fte copy update

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https://hg.mozilla.org/integration/gaia-central/rev/a093f22ab8f8
Author: Jared Hirsch <ohai@6a68.net>
Desc: Bug 987419 - Update copy in fxa panel within FTE r=arcturus
Bumping manifests a=b2g-bump