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

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https://hg.mozilla.org/integration/gaia-central/rev/290ea329dd2a
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #16684 from timdream/keyboard2-keyboard

Bug 975966 - [keyboard refactor] Convert suggestions.js to instantiable pattern, r=rudyl

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https://hg.mozilla.org/integration/gaia-central/rev/bac24c34837a
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 975966 - [keyboard refactor] Convert suggestions.js to instantiable pattern
Bumping manifests a=b2g-bump