Bumping gaia.json for 1 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/fced758fbf0b
Author: Corey Frang <gnarf37@gmail.com>
Desc: Bug 887737 - [SMS] The device is not recognizing the phone number received completely - r=julienw

* Rewrite the phone number matching regexp
* Include all the fixtures from Utils tests in FixturePhones and include in setup so we can share test cases