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

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https://hg.mozilla.org/integration/gaia-central/rev/10a9cab9cf34
Author: Gregor Wagner <anygregor@gmail.com>
Desc: Merge pull request #11540 from gregorwagner/lockscreen

Bug 903563 - JavaScript errors evt.target.dataset is undefined

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https://hg.mozilla.org/integration/gaia-central/rev/86a4b98299e9
Author: Gregor Wagner <anygregor@gmail.com>
Desc: Bug 903563 - JavaScript errors evt.target.dataset is undefined