Bumping gaia.json for 1 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/569e03bef166
Author: Jonathan Griffin <jgriffin@mozilla.com>
Desc: Bug 947855 - Revert "Merge pull request #15869 from jaoo/947855" for gaia-unit bustage on TBPL.

This reverts commit 8b298d51cb928f92b216b0f47e75d224568b9dfb, reversing
changes made to 853a44a11f04974086a1105b54393a1b171db05e.
Bumping manifests a=b2g-bump