Bumping gaia.json for 1 gaia-1_2 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_2/rev/b5b1d9aa0cc4
Author: Sergey Tupchiy <tupchii.sergii@gmail.com>
Desc: Bug 934402 - Write an atom to send SMS using 'MozSMS' API