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

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https://hg.mozilla.org/integration/gaia-central/rev/a167b4e898b1
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #19757 from sharaf-tir/Bug_1013764_Include_the_screen_dimming_time_also_in_Screen_time_out

Bug 1013764 - [System] Include the screen dimming time also in Screen ti...

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https://hg.mozilla.org/integration/gaia-central/rev/04cdef35a5b7
Author: sharfudheen.parambil <sharfudheen.parambil@lge.com>
Desc: Bug 1013764 - [System] Include the screen dimming time also in Screen time out.
Bumping manifests a=b2g-bump