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

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https://hg.mozilla.org/integration/gaia-central/rev/9a2c91393044
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #22228 from mozmark/bug1042702

Bug 1042702 - Logging out while not registered leaks a wakelock. r=gerar...

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https://hg.mozilla.org/integration/gaia-central/rev/d88170451afc
Author: Mark Goodwin <mgoodwin@mozilla.com>
Desc: Bug 1042702 - Logging out while not registered leaks a wakelock. r=gerard-majax
Bumping manifests a=b2g-bump