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

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https://hg.mozilla.org/integration/gaia-central/rev/a73d5a8bd6f0
Author: RickyChien <ricky060709@gmail.com>
Desc: Merge pull request #20521 from RickyChien/bug-1014400-follow-up

Bug 1014400 - Follow-up, update gaia_node_modules.revision r=me

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https://hg.mozilla.org/integration/gaia-central/rev/330f5f47d779
Author: Ricky Chien <ricky060709@gmail.com>
Desc: Bug 1014400 - Follow-up, update gaia_node_modules.revision
Bumping manifests a=b2g-bump