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

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https://hg.mozilla.org/integration/gaia-1_3/rev/56e63f0f97da
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Revert "Merge pull request #19891 from malini/v1.3"

This reverts commit ca34a11e16c3583eda059a7fea7d88acc67f83a4, reversing
changes made to 56f15bef5b23dcb239bfa14bd691f530ab46e603.
Bumping manifests a=b2g-bump