Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/0e8415a2ff97
Author: evanxd <itoyxd@gmail.com>
Desc: Merge pull request #19026 from crh0716/968694

Bug 968694 - Add marionette tests for the root panel

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https://hg.mozilla.org/integration/gaia-central/rev/4230ee7a9a6a
Author: Arthur Chen <crh0716@gmail.com>
Desc: Bug 968694 - Add marionette tests for the root panel

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https://hg.mozilla.org/integration/gaia-central/rev/3646a7bef143
Author: rnowm <arnau@arnaumarch.com>
Desc: Revert "Merge pull request #19204 from rnowm/1004710"

This reverts commit 24ba1627cf118846c938130693c592378c2589dd, reversing
changes made to ae13faeee2584fa53b055252c86a87cfe544f382.
Bumping manifests a=b2g-bump