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

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https://hg.mozilla.org/integration/gaia-2_0/rev/a8a87a6ed8ae
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #20912 from crh0716/1000173_v2.0

Bug 1000173 - Display User Icon in Settings When FMD is Remotely Tracking Device r=arthurcc

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https://hg.mozilla.org/integration/gaia-2_0/rev/3f0e48909d53
Author: yglazko <yglazko@yglazko.local>
Desc: Bug 1000173 - Display User Icon in Settings When FMD is Remotely Tracking Device
Bumping manifests a=b2g-bump