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

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https://hg.mozilla.org/integration/gaia-central/rev/88ca6c5127a6
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Merge pull request #13422 from dominickuo/bug-935326

Bug 935326 - [music] Handle the share button when the player is not launched by open activity, r=@jimporter

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https://hg.mozilla.org/integration/gaia-central/rev/a66ad3e6394e
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Bug 935326 - [music] Handle the share button when the player is not launched by open activity