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

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https://hg.mozilla.org/integration/gaia-central/rev/81e23789be37
Author: Sam Joch <samuel@guiora.com>
Desc: Merge pull request #11461 from pivanov/bug-903477

Bug 903477 - [Bluetooth] Bluetooth icons inner shadow is too dark - tone down r=samjoch

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https://hg.mozilla.org/integration/gaia-central/rev/86cba5a078e3
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 903477 - [Bluetooth] Bluetooth icons inner shadow is too dark - tone down