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

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https://hg.mozilla.org/integration/gaia-central/rev/ab0000d0f6dc
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 1101518 - [Build] Don't rewrite "async" scripts, and fix the skipping operation r=rickychien
Bumping manifests a=b2g-bump