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

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https://hg.mozilla.org/integration/gaia-central/rev/8309202d2b5d
Author: Robert Chira <robertchira@P5075.(none)>
Desc: Bug 1107460 - [v2.2] Update marionette version to 0.8.5
Bumping manifests a=b2g-bump