Bumping gaia.json for 2 gaia-1_3 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_3/rev/b15428bc199c
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #15944 from KevinGrandon/bug_967098_follow_up_styling

Bug 967098 - Follow-up, select box styling r=vingtetun

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https://hg.mozilla.org/integration/gaia-1_3/rev/8861f0f3e565
Author: vingtetun <21@vingtetun.org>
Desc: Merge pull request #15931 from staktrace/apzc_prefs

Bug 967098 - Expose some pre-configured displayport heuristics from the ...