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

========

https://hg.mozilla.org/integration/gaia-central/rev/6324e5d966f4
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Revert "Merge pull request #16228 from mcav/vibrate"

This reverts commit 3c54aedf659b4792e4a1eb1f3ede8b266138cef7, reversing
changes made to ccae0d08943c3a33a25a2701ad9e38f31908ad3a.
Bumping manifests a=b2g-bump