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

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https://hg.mozilla.org/integration/gaia-central/rev/bd76f7afa5b3
Author: Gabriele Svelto <gsvelto@mozilla.com>
Desc: Merge pull request #16741 from gabrielesvelto/bug-951764-apns-whatevah

Bug 951764 - Add bearer data to APN settings

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https://hg.mozilla.org/integration/gaia-central/rev/eed9d8098717
Author: Gabriele Svelto <gsvelto@mozilla.com>
Desc: Bug 951764 - Add network type filtering to the APN selection r=kaze

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https://hg.mozilla.org/integration/gaia-central/rev/05a216288333
Author: Gabriele Svelto <gsvelto@mozilla.com>
Desc: Bug 951764 - Filter APNs by bearer/network type r=kaze
Bumping manifests a=b2g-bump