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

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https://hg.mozilla.org/integration/gaia-central/rev/6aa09163e2b5
Author: James Burke <jrburke@gmail.com>
Desc: Merge pull request #20464 from jrburke/bug837677-email-startup-events

Bug 837677 - [e-mail] Implement new startup loading events r=mcav

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https://hg.mozilla.org/integration/gaia-central/rev/594ec96d7aa1
Author: jrburke <jrburke@gmail.com>
Desc: Bug 837677 - [e-mail] Implement new startup loading events
Bumping manifests a=b2g-bump