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

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https://hg.mozilla.org/integration/gaia-central/rev/5ef186739264
Author: Carsten Book -Tomcat- <cbook@mozilla.com>
Desc: Revert "Bug 952415 - [Rocketbar] Duplicate results should not appear." for test failures in gaia unit tests

This reverts commit 58a4f986cbeec58c81a7cc16c4b001888e7d2898.
Bumping manifests a=b2g-bump