Bumping gaia.json for 1 gaia-1_3 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_3/rev/4f06b37067f0
Author: Rudy Lu <me@rudy.lu>
Desc: Merge pull request #15138 from RudyLu/homescreen/Bug951563_css_tweak_wvga

Bug 951563 - CSS fix for the 5th row of app label on WVGA resolution.
r=crdlc.(cherry picked from commit e38079f27bd38d669c4f1eaf252429285523cb7a)