Bumping gaia.json for 2 gaia-1_3 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_3/rev/6345bf93b9e5
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Merge pull request #15095 from davidflanagan/bug951920v1.3

Merge pull request #15016 from davidflanagan/bug951920

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https://hg.mozilla.org/integration/gaia-1_3/rev/e511c01ca70c
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Merge pull request #15016 from davidflanagan/bug951920

Bug 951920: fix visuals for alternative character popups r=rudylu(cherry picked from commit 3d27ec08f47652d181f9653366143adc772c84bd)