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

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https://hg.mozilla.org/integration/gaia-central/rev/3fb358a794fd
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Merge pull request #14725 from mcav/fix-pop3-header

Bug 950200 - [Email][V1.3][POP3] Please change the "SettingS" of POP3 configuration page to "Settings"

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https://hg.mozilla.org/integration/gaia-central/rev/bb8c822e483f
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Bug 950200 - [Email][V1.3][POP3] Please change the "SettingS" of POP3 configuration page to "Settings"