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

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https://hg.mozilla.org/integration/gaia-1_3/rev/4847c66c4223
Author: Rudy Lu <me@rudy.lu>
Desc:  Bug 983012 - [Sora][Message][Input method]The virtual keyboard is
 disable after switching the keyboard as pinyin.
   - Remove the touchmove event listeners from the touched keys
   when switching layouts.
r=timdream
a=fabrice
Bumping manifests a=b2g-bump