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

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https://hg.mozilla.org/integration/gaia-central/rev/25c65e3bdbfb
Author: James Burke <jrburke@gmail.com>
Desc: Merge pull request #20727 from jrburke/bug1027185-email-certified

Bug 1027185 - [email] switch manifest type back to certified r=mcav

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https://hg.mozilla.org/integration/gaia-central/rev/c27d7cf45074
Author: jrburke <jrburke@gmail.com>
Desc: Bug 1027185 - [email] switch manifest type back to certified
Bumping manifests a=b2g-bump