Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/66effd43708e
Author: Gabriele Svelto <gsvelto@mozilla.com>
Desc: Merge pull request #17205 from gabrielesvelto/bug-947192-dsds

Bug 947192 - Add SIM number to the WAP Push message notification

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https://hg.mozilla.org/integration/gaia-central/rev/6a3bfbf7139c
Author: Gabriele Svelto <gsvelto@mozilla.com>
Desc: Bug 947192 - If multiple SIMs are present add the SIM number to the notification r=julienw

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https://hg.mozilla.org/integration/gaia-central/rev/5ca59eeed970
Author: Gabriele Svelto <gsvelto@mozilla.com>
Desc: Bug 947192 - Simplify the way notifications are sent, simplify the tests accordingly r=julienw
Bumping manifests a=b2g-bump