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

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https://hg.mozilla.org/integration/gaia-central/rev/7086fc75af7c
Author: Ben Kelly <ben@wanderview.com>
Desc: Revert "Merge pull request #15774 from wanderview/opus-json"

This reverts commit 6f968274d05ba8cf30b8b9c45b50b3f2ca220af7, reversing
changes made to 09ae464cb04f056aaf8272636a9d4f51f5f9a395.

Conflicts:
	apps/communications/ftu/test/unit/resources/customization.json
Bumping manifests a=b2g-bump