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

========

https://hg.mozilla.org/integration/gaia-1_2/rev/a94b6bc065f3
Author: Gabriele Svelto <gsvelto@mozilla.com>
Desc: Bug 922569 - Fix DTMF tone length when in long mode r=etienne