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

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https://hg.mozilla.org/integration/gaia-1_4/rev/8482d3515925
Author: chirarobert <robert.chira@softvision.ro>
Desc: Bug 987133 - Unxfail and fix test_cards_view_with_two_apps.py
Bumping manifests a=b2g-bump