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

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https://hg.mozilla.org/integration/gaia-central/rev/4df063ef639a
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #18691 from KevinGrandon/bug_1001224_update_node_modules

Bug 1001224 - Update gaia-node-modules to latest

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https://hg.mozilla.org/integration/gaia-central/rev/adc2e12f9ba3
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1001224 - Update gaia-node-modules to latest
Bumping manifests a=b2g-bump