Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/911e39880486
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Merge pull request #24645 from dominickuo/bug-1043712-new

Bug 1043712 - [Music] listen to touchend instead of click events, r=shamenchens

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https://hg.mozilla.org/integration/gaia-central/rev/9c648de523b0
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Bug 1043712 - [Music] listen to touchend instead of click events
Bumping manifests a=b2g-bump