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

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https://hg.mozilla.org/integration/gaia-central/rev/a1b136d75c16
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #14103 from mikehenrty/bug-926347-dualsim2

Bug 926347 dualsim2

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https://hg.mozilla.org/integration/gaia-central/rev/696edbb9a855
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Bug 926347 - updating SIM unlocking in FTU to include dual-sim and SIM info screen