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

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https://hg.mozilla.org/integration/gaia-2_0/rev/214726a46d98
Author: Hubert Figuière <hub@figuiere.net>
Desc: Merge pull request #22524 from hfiguiere/v2.0

Bug 1033402 - Wait for the available marionette socket. a=test-only r=kgrandon

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https://hg.mozilla.org/integration/gaia-2_0/rev/dfd9f4bb18ef
Author: Hubert Figuière <hub@figuiere.net>
Desc: Bug 1033402 - Wait for the available marionette socket. a=test-only

Also part of bug 1027232
Bumping manifests a=b2g-bump