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

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https://hg.mozilla.org/integration/gaia-central/rev/a799ae659d49
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #21057 from anefzaoui/bug-1030813

Bug 1030813 - Wrong tick icon position in value selector - follow up for 1028701

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https://hg.mozilla.org/integration/gaia-central/rev/d3fac05d2c56
Author: Ahmed Nefzaoui <nefzaoui.ahmed@hotmail.com>
Desc: Bug 1030813 - Wrong tick icon position in value selector - follow up for 1028701
Bumping manifests a=b2g-bump