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

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https://hg.mozilla.org/integration/gaia-central/rev/4d41ec1d14c4
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Merge pull request #10798 from dominickuo/bug-881151

Bug 881151 - hdpi/xhdpi resolution assets and layout for Music app, r=basiclines

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https://hg.mozilla.org/integration/gaia-central/rev/19fb3b6101a7
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Bug 881151 - [music] add @1.5x images