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

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https://hg.mozilla.org/integration/gaia-2_0/rev/b72eea29d9fd
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1021276 - [2.0 Uplift] The Comms Icons Need Colour Tweaks for Differentiation
Bumping manifests a=b2g-bump