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

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https://hg.mozilla.org/integration/gaia-central/rev/8cb6303fe1f8
Author: Zac <zcampbell@mozilla.com>
Desc: Bug 985341 - Repair manifest file change from bug 985341 a=testonly r=me
Bumping manifests a=b2g-bump