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

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https://hg.mozilla.org/integration/gaia-central/rev/3743c5331ed5
Author: Mason Chang <mason@masonchang.com>
Desc: Merge pull request #14271 from changm/bug942337

bug 942337 - will-animate css property for contacts app

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https://hg.mozilla.org/integration/gaia-central/rev/f5e8bf5851b3
Author: Mason Chang <mchang@mozilla.com>
Desc: bug94233 will-animate css property for contacts app