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

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https://hg.mozilla.org/integration/gaia-central/rev/4ec0216e9571
Author: ochameau <poirot.alex@gmail.com>
Desc: Merge pull request #10654 from mykmelez/battery-charging

Bug 887634 - Don't shut down because of low battery level if battery is charging r=vingtetun

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https://hg.mozilla.org/integration/gaia-central/rev/07ba4a8e816b
Author: Myk Melez <myk@mozilla.org>
Desc: don't shut down because of low battery level if battery is charging