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

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https://hg.mozilla.org/integration/gaia-central/rev/3669bf08c4a5
Author: Gabriele Svelto <gsvelto@mozilla.com>
Desc: Bug 1045023 - Ensure that the GaiaGrid component is loaded before it is used r=kgrandon
Bumping manifests a=b2g-bump