Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-2_0/rev/7b0ae3050022
Author: Wil Clouser <clouserw@gmail.com>
Desc: Merge pull request #26206 from clouserw/1083528.2

Bug 1083528 - Add dev/stage Marketplaces to 2.0  r=fabrice

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https://hg.mozilla.org/integration/gaia-2_0/rev/9ef1fc7328a4
Author: Wil Clouser <clouserw@gmail.com>
Desc: Bug 1083528 - Add dev/stage Marketplaces to 2.0
Bumping manifests a=b2g-bump