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

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https://hg.mozilla.org/integration/gaia-central/rev/96d05aecf390
Author: Ryan VanderMeulen <ryanvm@gmail.com>
Desc: Revert "Merge pull request #15849 from jonallengriffin/gaiaunitcrash"

This reverts commit 5a0f5ee71152e7f365bf078e345422bb2b1fef7c, reversing
changes made to 6b4def088138ef7d0af42767054d353be9d3bee3.
Bumping manifests a=b2g-bump