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

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https://hg.mozilla.org/integration/gaia-central/rev/16222b624638
Author: Jared Hirsch <ohai@6a68.net>
Desc: Merge pull request #19903 from 6a68/bug-1004251-fxa-resend-email

Bug 1004251 fxa resend email

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https://hg.mozilla.org/integration/gaia-central/rev/2f12bd24aa63
Author: Jared Hirsch <ohai@6a68.net>
Desc: Bug 1004251 - Add resend verification email to firefox accounts. r=ferjm,arthurcc
Bumping manifests a=b2g-bump