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

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https://hg.mozilla.org/integration/gaia-central/rev/3d0407f90b4c
Author: Luke Chang <lchang@mozilla.com>
Desc: Merge pull request #12140 from luke-chang/906617_keyboard_new_composition

Bug 906617 - Change Gaia keyboard app to use the new composition methods in IME WebAPI, r=rudylu

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https://hg.mozilla.org/integration/gaia-central/rev/3b0a94387084
Author: Luke Chang <lchang@mozilla.com>
Desc: Bug 906617 - Change Gaia keyboard app to use the new composition methods in IME WebAPI