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

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https://hg.mozilla.org/integration/gaia-central/rev/8e72e3b0376d
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Revert "Merge pull request #18647 from julienw/999553-reenable-most-disabled-unit-tests-enable-render-test"

This reverts commit 0d0746788fad5cb60937a8cc668b13fc6eadb105, reversing
changes made to c6f4657a4ec2d9fc4fff7b7b8f96f91ef3bd13c2.
Bumping manifests a=b2g-bump