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

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https://hg.mozilla.org/integration/gaia-2_1/rev/2bdacfbc9831
Author: Kyle Machulis <kyle@nonpolynomial.com>
Desc: Bug 1036691 - Fix settings includes for browser shims
Bumping manifests a=b2g-bump