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

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https://hg.mozilla.org/integration/gaia-central/rev/8ac6233ff9ef
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1110673 - merge pull request #26737 from julienw:1110673-fix-regression-with-previousLux to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/d59f5d7bfe20
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 1110673 - [System] When disabling/enabling auto-brightness, the previous brightness is not restored r=timdream
Bumping manifests a=b2g-bump