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

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https://hg.mozilla.org/integration/gaia-central/rev/a67e099458fd
Author: Zac <zcampbell@mozilla.com>
Desc: Bug 1004413 - test_ftu.py wait for languages to be listed rather than assert a=testonly r=me
Bumping manifests a=b2g-bump