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

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https://hg.mozilla.org/integration/gaia-central/rev/fb2ad83a390b
Author: Rudy Lu <me@rudy.lu>
Desc: Merge pull request #22480 from RudyLu/keyboard/Bug1020779-reland

Bug 1020779 - Adjust the key alignment for the bottom row of keyboard.
r=timdream.

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https://hg.mozilla.org/integration/gaia-central/rev/3278481a5c9a
Author: Rudy Lu <me@rudy.lu>
Desc: Bug 1020779 - Adjust the key alignment for the bottom row of keyboard.
 - Reland, r=timdream.
Bumping manifests a=b2g-bump