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

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https://hg.mozilla.org/integration/gaia-2_1/rev/9227c3d3825d
Author: George <georgeiscoming@gmail.com>
Desc: Merge pull request #25259 from cctuan/1078707-v21

Bug 1078707 - Closing apps no longer works via DevTools

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https://hg.mozilla.org/integration/gaia-2_1/rev/6e84928df48d
Author: cctuan <georgeiscoming@gmail.com>
Desc: Bug 1078707 - Closing apps no longer works via DevTools
Bumping manifests a=b2g-bump