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

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https://hg.mozilla.org/integration/gaia-central/rev/1964c40fbafe
Author: Gareth Aye <gaye@mozilla.com>
Desc: Add calendar-1.4-visual-refresh to travis branches

We can remove this once the branch lands on master.
Bumping manifests a=b2g-bump