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

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https://hg.mozilla.org/integration/gaia-central/rev/2f947703e8fd
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Merge pull request #15482 from eeejay/bug-961169

Bug 961169 - [Settings] Clean up range inputs, and make them more screen... r=kaze

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https://hg.mozilla.org/integration/gaia-central/rev/d07e762767ae
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Bug 961169 - [Settings] Clean up range inputs, and make them more screen reader friendly.
Bumping manifests a=b2g-bump