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/16d2c927d031
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 942460 - [Contacts] Implement position:sticky for fixed headers r=bkelly