Bumping gaia.json for 1 gaia-1_2 revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-1_2/rev/50f8b6535b32
Author: James Lal <james@lightsofapollo.com>
Desc: Revert "Merge pull request #12417 from evelynhung/issue-900399"

This reverts commit 998b22382dda6e136866a553d8665d9f9a8f3398.