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

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https://hg.mozilla.org/integration/gaia-central/rev/de86c8e1b189
Author: Arthur Chen <crh0716@gmail.com>
Desc: Bug 983080 - Add 2.25x icons to settings app
Bumping manifests a=b2g-bump