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/63e8a5a8a751
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #15622 from dwilsoncaf/bug-960756-v1.3

Bug 960756 - Add CONFIG_MAX_SNAPSHOT_PIXEL_SIZE. r=djf

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https://hg.mozilla.org/integration/gaia-1_3/rev/64ae57b9f008
Author: Diego Wilson <dwilson@codeaurora.org>
Desc: Bug 960756 - Add CONFIG_MAX_SNAPSHOT_PIXEL_SIZE. r=djf

This allows configuration of the max resolution of camera snapshots
independently from the max resolution of displayed images.