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

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https://hg.mozilla.org/integration/gaia-central/rev/a950e94f01a4
Author: Arthur Chen <crh0716@gmail.com>
Desc: Revert "Merge pull request #25997 from crh0716/1090843"

This reverts commit 07e24e6f19271bedaa4bb0294e17eeefa9401997, reversing
changes made to f20b72cb0e3ad4888642906ae3ce27bacff010b2.
Bumping manifests a=b2g-bump