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

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https://hg.mozilla.org/integration/gaia-central/rev/1d3a29265764
Author: Ghislain 'Aus' Lacroix <aus@noiseport.org>
Desc: Merge pull request #12323 from nullaus/891724-supportcontactcustomization

bug 891724

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https://hg.mozilla.org/integration/gaia-central/rev/4aca518388b7
Author: Ghislain 'Aus' Lacroix <aus@noiseport.org>
Desc: bug 891724

Add ability to customize Support Contacts via variant json files.

r=qDot