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

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https://hg.mozilla.org/integration/gaia-central/rev/f81a113f2dec
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #15761 from etiennesegonzac/bug-963582-persona-popup-fix

Bug 963582 - Backing out part of bug 962547 to fix the trustedUI display tied to a transitionend. r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/9123533145e0
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Bug 963582 - Backing out part of bug 962547 to fix the trustedUI display tied to a transitionend.
Bumping manifests a=b2g-bump