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

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https://hg.mozilla.org/integration/gaia-central/rev/8f61e7de9914
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #26354 from KevinGrandon/bug_1101099_intermittent_hierarchy_manager_test

Bug 1101099 - Add waitFor for rocketbar closing

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https://hg.mozilla.org/integration/gaia-central/rev/3e670db813d0
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1101099 - Add waitFor for rocketbar closing r=alive
Bumping manifests a=b2g-bump