Bumping gaia.json for 1 gaia-1_2 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_2/rev/ca962ba82512
Author: Julien Wajsberg <felash@gmail.com>
Desc: Revert "Merge pull request #14611 from arroway/bug-797661"

This reverts commit 724d36716bcbbc5cee1af18b94cc328c289d0ccc.