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

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https://hg.mozilla.org/integration/gaia-2_0/rev/1d3f0b684a9e
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #19899 from mschwart/bug991949

Bug 991949 - Cell broadcast ETWS messages show undefined, r=timdream
Bumping manifests a=b2g-bump