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

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https://hg.mozilla.org/integration/gaia-central/rev/8a192fcf2927
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #14572 from crh0716/948852

Bug 948852 - Fix the event creation error r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/745b0e8f854a
Author: Arthur Chen <crh0716@gmail.com>
Desc: Bug 948852 - Fix the event creation error