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

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https://hg.mozilla.org/integration/gaia-central/rev/d13dde1c4743
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #14864 from bitgeeky/944426final

Bug 944426 - Test for flow from Messages app to Messaging Settings, r=zc...

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https://hg.mozilla.org/integration/gaia-central/rev/a5311e34b82c
Author: bitgeeky <mozpankaj1994@gmail.com>
Desc: Bug 944426 - Test for flow from Messages app to Messaging Settings, r=zcampbell@mozilla.com