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

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https://hg.mozilla.org/integration/gaia-2_1/rev/2c2f367adeb6
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Bug 1061012 - Fixing the callscreen window visibility and preventing the creation of an audio context at preload.
Bumping manifests a=b2g-bump