Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/371393ff791d
Author: Arnau <arnau@arnaumarch.com>
Desc: Merge pull request #20496 from rnowm/997667-wcomp

Bug 997667 - [Building Blocks] Arrow button text should be centered r=fcampo r=marina

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https://hg.mozilla.org/integration/gaia-central/rev/6e2a876ccda4
Author: rnowm <arnau@arnaumarch.com>
Desc: Bug 997667 - [Building Blocks] Arrow button text should be centered

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https://hg.mozilla.org/integration/gaia-central/rev/107f476be4a2
Author: Jared Hirsch <ohai@6a68.net>
Desc: Merge pull request #20472 from 6a68/bug-1021523-fxa-ftu-verified-string

Bug 1021523 - Add verified case to fxa ftu completed screen

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https://hg.mozilla.org/integration/gaia-central/rev/b7fb73c67da0
Author: Jared Hirsch <ohai@6a68.net>
Desc: Bug 1021523 - Add verified case to fxa ftu completed screen r=arcturus
Bumping manifests a=b2g-bump