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/68a96d85f546
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Revert "Merge pull request #15653 from dominickuo/bug-946556"

This reverts commit f9a37c77efb4621a1f57e4695b497d18601fe134.