Bumping gaia.json for 1 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/74f8794e29d3
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Revert "Update node modules for Bug 997045"

This reverts commit a19c22eb8130d42b2beb24d8eec99c52e9cee3b7.
Bumping manifests a=b2g-bump