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

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https://hg.mozilla.org/integration/gaia-central/rev/56a87e83b4d9
Author: Alive.Kuo <alegnadise@gmail.com>
Desc: Merge pull request #10687 from alivedise/bugzilla/888170/lint

Bug 888170 - Fix lint, r=me

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https://hg.mozilla.org/integration/gaia-central/rev/15c3c1cb392f
Author: Alive Kuo <alegnadise@gmail.com>
Desc: Bug 888170 - Fix lint