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

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https://hg.mozilla.org/integration/gaia-central/rev/69cbd46486da
Author: gasolin <gasolin@gmail.com>
Desc: Revert "Merge pull request #21388 from gasolin/issue-951538"

This reverts commit 6c2a1b999251900aed67dff4ec44f9c4cd3165a8, reversing
changes made to 43c54f758c614160b0183429021ea974bc988905.
Bumping manifests a=b2g-bump