Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/b9f86acc02f7
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #16410 from vijayanandh/commsfix

Bug 953031 - Communications app needs an icon; r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/614f3bb6ef44
Author: vijayanandh <vijayanand.hongal@accenture.com>
Desc: Bug 953031: Communications app needs an icon; r=reviews
Bumping manifests a=b2g-bump