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

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https://hg.mozilla.org/integration/gaia-central/rev/6730d720cdf1
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #26056 from KevinGrandon/bug_969215_sync_package_json

Bug 969215 - Follow-up, update node modules revision

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https://hg.mozilla.org/integration/gaia-central/rev/04dc4c8168c9
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 969215 - Follow-up, update node modules revision r=kgrandon
Bumping manifests a=b2g-bump