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

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https://hg.mozilla.org/integration/gaia-central/rev/31ffa7847723
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #25344 from KevinGrandon/bug_1085605_intermittent_settings_device_info_test

Bug 1085605 - [Settings] Use a more qualified CSS selector in order to select the correct gaia-header

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https://hg.mozilla.org/integration/gaia-central/rev/0a41a201c4c8
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1085605 - [Settings] Use a more qualified CSS selector in order to select the correct gaia-header r=arthurcc
Bumping manifests a=b2g-bump