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

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https://hg.mozilla.org/integration/gaia-central/rev/b185da4b8580
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #8726 from leob2g/Bug_852361_Device_is_shut_down_when_battery_level_become_two_percents

Bug 852361 - [System] Device is shut down when battery level become two percents(cherry picked from commit a7f1e921c67d5d3d4e0afaa06aca79320784e806)