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

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https://hg.mozilla.org/integration/gaia-central/rev/2ffeaf724973
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Merge pull request #11869 from mcav/imap-parsing-bug-901926

Bug 901926 - [Email] Email app stops working if attachment contains an IMAP literal. r=asuth

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https://hg.mozilla.org/integration/gaia-central/rev/1c4eadcff8ec
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Bug 901926 - [Email] Email app stops working if attachment contains an IMAP literal. r=asuth