Bumping gaia.json for 1 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/34d65c72a523
Author: Gabriele Svelto <gsvelto@mozilla.com>
Desc: Bug 927062 - Remove the 'add call' button when in CDMA call waiting mode r=etienne