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

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https://hg.mozilla.org/integration/gaia-2_0/rev/73f32978350d
Author: KWierso <kwierso@gmail.com>
Desc: Revert "Merge pull request #20296 from mcjimenez/bug1023142" for gaia-linter bustage

This reverts commit a5913318bfe49f4f077a6a6bbcabf8157584e8b4.
Bumping manifests a=b2g-bump