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

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https://hg.mozilla.org/integration/gaia-central/rev/d6417001bd48
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #26397 from timdream/keyboard-audio-api

Bug 1103574 - Use Web Audio API to play keyboard clicker sounds, r=mnjul

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https://hg.mozilla.org/integration/gaia-central/rev/ca754ced6002
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 1103574 - Use Web Audio API to play keyboard clicker sounds
Bumping manifests a=b2g-bump