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

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https://hg.mozilla.org/integration/gaia-1_3/rev/255cc66c02da
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #14103 from mikehenrty/bug-926347-dualsim2

Bug 926347 dualsim2
(cherry picked from commit e2c232208f0177d7a9305a60a6c59e62d98a67a2)