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

========

https://hg.mozilla.org/integration/gaia-central/rev/cf485db0bb44
Author: Zac <zcampbell@mozilla.com>
Desc: Bug 1078156 - Disable intermittent test_a11y_keyboard_word_suggestions.py a=test-only
Bumping manifests a=b2g-bump