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

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https://hg.mozilla.org/integration/gaia-central/rev/85ee1d7c8429
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #15319 from KevinGrandon/bug_958340_node_modules_prototype

Bug 958340 - Download node_modules from github

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https://hg.mozilla.org/integration/gaia-central/rev/940e50d9fd4f
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 958340 - Download node_modules from github
Bumping manifests a=b2g-bump