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

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https://hg.mozilla.org/integration/gaia-central/rev/296994ca42ce
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #19663 from timdream/keyboard-promise-fix2

Bug 1016179 - [Keyboard] Correct Promise usage and some API changes, r=rudyl

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https://hg.mozilla.org/integration/gaia-central/rev/0d020e3e41ef
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 1016179 - [Keyboard] Correct Promise usage and some API changes
Bumping manifests a=b2g-bump