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/7d6e68e80014
Author: Rudy Lu <me@rudy.lu>
Desc: Merge pull request #14488 from RudyLu/keyboard/Bug888253-keyboard_settings_migration

 Bug 888253 - Settings data migration for keyboard layouts.
r=gnarf, gary, yuren(cherry picked from commit 51ed5c6b6bda46284e797648b4b44dc9f804b14b)
a=koi+

Conflicts:
	build/settings.js