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

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https://hg.mozilla.org/integration/gaia-central/rev/3f66811d103f
Author: James Burke <jrburke@gmail.com>
Desc: Merge pull request #15850 from jrburke/bug965987-email-search-broke

Bug 965987 - [B2G][Email] The search icon at the bottom menu while in Inbox is unresponsive r=asuth

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https://hg.mozilla.org/integration/gaia-central/rev/dffb9fb70dc4
Author: jrburke <jrburke@gmail.com>
Desc: Bug 965987 - [B2G][Email] The search icon at the bottom menu while in Inbox is unresponsive
Bumping manifests a=b2g-bump