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

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https://hg.mozilla.org/integration/gaia-central/rev/1b8fba13f1a8
Author: Sam Joch <samuel@guiora.com>
Desc: Merge pull request #11458 from pivanov/bug-903365

Bug 903365 - [Settings][HD] Settings icons inner shadow is too dark - tone down r=samjoch

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https://hg.mozilla.org/integration/gaia-central/rev/c65b13c80834
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 903365 - [Settings][HD] Settings icons inner shadow is too dark - tone down