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/16497393a876
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #15648 from etiennesegonzac/bug-907112-lockscreen-too-easy-unlock

Bug 907112 - Prevent the phone from unlocking in my pants r=alive
(cherry picked from commit 2946ccc07ec28cea44994d98598b85db301edd12)

a=fabrice