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

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https://hg.mozilla.org/integration/gaia-central/rev/9c9dc56d40f0
Author: Gabriele Svelto <gsvelto@mozilla.com>
Desc: Revert "Bug 1067731 - Display immediately WAP Push signal indication messages with the signal-high action set r=julienw"

This reverts commit db92ae26d66e8a8e1faed4f65009d2da00ad066a.
Bumping manifests a=b2g-bump