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

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https://hg.mozilla.org/integration/gaia-central/rev/93333daac801
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Merge pull request #11474 from dominickuo/bug-894203

Bug 894203 - Update the @1.5x assets for music app, r=rexboy7

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https://hg.mozilla.org/integration/gaia-central/rev/a352b9a46b36
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Bug 894203 - Update the @1.5x assets for music app