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

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https://hg.mozilla.org/integration/gaia-2_0/rev/85787a5e9d30
Author: jrburke <jrburke@gmail.com>
Desc: Bug 1095818 v2.1 - [email] app startup by notification goes to message list instead of message reader
Bumping manifests a=b2g-bump