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

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https://hg.mozilla.org/integration/gaia-central/rev/bcb4785e004c
Author: KWierso <kwierso@gmail.com>
Desc: Revert "Merge pull request #23603 from EragonJ/bug-1042135" for b2g desktop mochitest-1 failures

This reverts commit b00c0f597a0a0404975fe929230da0b5a805b59c, reversing
changes made to d37950eb09e28aa18d0e01df9ff90574bd4337e0.
Bumping manifests a=b2g-bump