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

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https://hg.mozilla.org/integration/gaia-1_4/rev/9bbdb3e03558
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 985498 - Disable intermittent failing test, test_homescreen_delete_app.py
Bumping manifests a=b2g-bump