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/2682aa435cf7
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #15052 from cvan/mkt-icons

Bug 944224 - Forgo data URIs for Marketplace homescreen icons, r=fabrice
(cherry picked from commit 43382bab150125ba0817f4c18e5d76d6d028e8a5)

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https://hg.mozilla.org/integration/gaia-1_3/rev/fe4437ad5161
Author: lissyx <lissyx+github@lissyx.dyndns.org>
Desc: Merge pull request #14648 from lissyx/bug910999

Bug 910999 - Correct display and removal of voicemail notification r=alive,julienw
(cherry picked from commit 024357ef445fc52f84283897203386430ba4dc0d)