Bumping gaia.json for 2 gaia-1_2 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_2/rev/37dff68e5d54
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #8726 from leob2g/Bug_852361_Device_is_shut_down_when_battery_level_become_two_percents

Bug 852361 - [System] Device is shut down when battery level become two percents(cherry picked from commit a7f1e921c67d5d3d4e0afaa06aca79320784e806)

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https://hg.mozilla.org/integration/gaia-1_2/rev/a16bfb33133a
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #13033 from gitmai/bug-928918-export-vcard-phonenumber

Bug 928918 -Follow up to Bug 914999 The phone of a contact exported to vCard does not appear when it has certain mobile type assigned(cherry picked from commit 397e06b63ab7f9941688f6d139135fbe5e992417)