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

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https://hg.mozilla.org/integration/gaia-2_0/rev/4cf310c07a3d
Author: Jared Hirsch <ohai@6a68.net>
Desc: Merge pull request #20769 from 6a68/uplift-bug-1027487-to-v2

Bug 1027487 - Point FMD Client to New Stage Server URLs

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https://hg.mozilla.org/integration/gaia-2_0/rev/ca730f7c067f
Author: Jared Hirsch <ohai@6a68.net>
Desc: Bug 1027487 - Point FMD Client to New Stage Server URLs
Bumping manifests a=b2g-bump