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

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https://hg.mozilla.org/integration/gaia-central/rev/b75aca2269be
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Revert "Merge pull request #24741 from RickyChien/bug-1053703"

This reverts commit 6394efe72ce08843ef183d42d7eb1f8263be47ed, reversing
changes made to 83f495a1c12687970f7f2840c2729795c4b88177.
Bumping manifests a=b2g-bump