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

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https://hg.mozilla.org/integration/gaia-central/rev/99c62f5a3041
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Merge pull request #13096 from dominickuo/bug-901421-advance

Bug 901421 - [music] add MediaDB.advancedEnumerate() for random accessing records to fix issues on shuffling all songs, r=@jimporter

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https://hg.mozilla.org/integration/gaia-central/rev/6ba4aafc4ffe
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Bug 901421 - [music] add MediaDB.advancedEnumerate() for random accessing records to fix issues on shuffling all songs