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

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https://hg.mozilla.org/integration/gaia-2_0/rev/16e93b0a67aa
Author: Sherman Chen <shamenchens@users.noreply.github.com>
Desc: Merge pull request #22241 from shamenchens/Bug1043708-MusicSearchBar

Bug 1043708 - Music search bar should not have gradient background, r=dkuo

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https://hg.mozilla.org/integration/gaia-2_0/rev/f6051ab38004
Author: Sherman Chen <shamen.chens@gmail.com>
Desc: Bug 1043708 - Music search bar should not have gradient background
Bumping manifests a=b2g-bump