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

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https://hg.mozilla.org/integration/gaia-central/rev/dd94fb2c581d
Author: RickyChien <ricky060709@gmail.com>
Desc: Merge pull request #18487 from RickyChien/bug_998757_follow_up_modules_revision

Bug 998757 - Follow-up, update gaia_node_modules.revision r=me

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https://hg.mozilla.org/integration/gaia-central/rev/beb85fca3eac
Author: Ricky Chien <ricky060709@gmail.com>
Desc: Bug 998757 - Follow-up, update gaia_node_modules.revision
Bumping manifests a=b2g-bump