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

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https://hg.mozilla.org/integration/gaia-2_1/rev/bafd93a8d0b9
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Bug 1110630 - Hide overlays on sheetsgestureend even if the app is already active.
Bumping manifests a=b2g-bump