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/62351db26c8d
Author: Rudy Lu <me@rudy.lu>
Desc: Merge pull request #16116 from RudyLu/keyboard/Bug967857-Bengali_UI

Bug 967857 - Add specific CSS rules for Bengali - Probhat keyboard to
r=timdream(cherry picked from commit 31af75189710e8930be943dc96a4ccd339a6010f)

Conflicts:
	apps/keyboard/style/keyboard.css