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

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https://hg.mozilla.org/integration/gaia-2_0/rev/3e6f9eaa6723
Author: Vivien Nicolas <vnicolas@mozilla.com>
Desc: Bug 1030248 - Use native context menu in the search app. r=kgrandon

Conflicts:
	apps/search/js/contextmenu.js
Bumping manifests a=b2g-bump