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

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https://hg.mozilla.org/integration/gaia-central/rev/7ab5709aff21
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Merge pull request #11031 from es92/music2update

music2: update 0.1.1
Landing with only the most cursory review because this is a prototype app in test_apps, not part of any build.

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https://hg.mozilla.org/integration/gaia-central/rev/72d841fbcb41
Author: Evan Shapiro <evan.a.shapiro@gmail.com>
Desc: music2: update 0.1.1