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

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https://hg.mozilla.org/integration/gaia-central/rev/e6de73456ea2
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 1007519: disable toggle_calendar_test.js again on Travis r=me
Bumping manifests a=b2g-bump