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

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https://hg.mozilla.org/integration/gaia-central/rev/e383007857f8
Author: James Burke <jrburke@gmail.com>
Desc: Merge pull request #20646 from jrburke/bug890647-email-unfork-value-selector

Bug 890647 - [email] unfork value_selector.css r=mcav

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https://hg.mozilla.org/integration/gaia-central/rev/29a43d687a97
Author: jrburke <jrburke@gmail.com>
Desc: Bug 890647 - [email] unfork value_selector.css
Bumping manifests a=b2g-bump