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/3e85fc2fce6d
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #13375 from crh0716/911701_1

Bug 911701 - Show data signal strength when connecting to EVDO r=alive(cherry picked from commit c83556b20bf42aea6e80b1987a91a631e401f1b8)