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

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https://hg.mozilla.org/integration/gaia-central/rev/e9b626d1d63a
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Merge pull request #15210 from mcav/fix-disappearing-attachments

Bug 950207 - [Email][V1.3][POP3] The attachment disappears when first time to open a mail. r=asuth

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https://hg.mozilla.org/integration/gaia-central/rev/821c7bbb2b6b
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Bug 950207 - [Email][V1.3][POP3] The attachment disappears when first time to open a mail. r=asuth