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

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https://hg.mozilla.org/integration/gaia-central/rev/5f1e3b7ecd82
Author: Kyle Machulis <kyle@nonpolynomial.com>
Desc: Merge pull request #12326 from nullaus/891724-supportcontactcustomization

891724 supportcontactcustomization

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https://hg.mozilla.org/integration/gaia-central/rev/442d4202fa9c
Author: Ghislain 'Aus' Lacroix <aus@mozilla.com>
Desc: bug 891724

Add ability to customize support contacts in Settings App, with unit test fixes.

r=qDot