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

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https://hg.mozilla.org/integration/gaia-central/rev/3229ec6e0f10
Author: Wilson Page <wilsonpage@me.com>
Desc: Merge pull request #22933 from wilsonpage/1016814

Bug 1016814 - [System] Update to use gaia-header

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https://hg.mozilla.org/integration/gaia-central/rev/c47377e60ffb
Author: Wilson Page <wilsonpage@me.com>
Desc: Bug 1016814 - [System] Update to use gaia-header
Bumping manifests a=b2g-bump