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/5d5b665df0d1
Author: Rudy Lu <left.lu@gmail.com>
Desc: Merge pull request #13110 from RudyLu/keyboard/Bug925003_greekSMS_master_v1.2

Bug 925003 - Add a new keyboard layout, "Greek SMS" to allow sending mes...
r=djf, julienw (cherry picked from commit 50c5c530ffef00cb7b24d00e23cbed80210105d2)

Conflicts:
	apps/keyboard/js/layout.js