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

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https://hg.mozilla.org/integration/gaia-central/rev/16bc3ed399af
Author: Ryan VanderMeulen <ryanvm@gmail.com>
Desc: Re-land "Merge pull request #15688 from vingtetun/bug961047"

This reverts commit b0cc15bf0d4369dad5c2806f66000c47b84fffba.
Bumping manifests a=b2g-bump