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

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https://hg.mozilla.org/integration/gaia-central/rev/fa9644133018
Author: Ghislain 'Aus' Lacroix <aus@noiseport.org>
Desc: Merge pull request #14784 from nullaus/bug949286-net-error

bug 949286

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https://hg.mozilla.org/integration/gaia-central/rev/56dea66daf4f
Author: Ghislain 'Aus' Lacroix <aus@mozilla.com>
Desc: bug 949286

-Handle dnsNotFound as well as netOffline errors in net_error.html/.js.