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

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https://hg.mozilla.org/integration/gaia-1_3/rev/96555441595d
Author: Ryan VanderMeulen <ryanvm@gmail.com>
Desc: Revert "Bug 981521 - Display notifications for messages with a "signal-none" action r=julienw"

This reverts commit 6194def5ceed3f4b9bc9de0ea2c11661cd439a27.
Bumping manifests a=b2g-bump