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

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https://hg.mozilla.org/integration/gaia-central/rev/b1ddc5d86896
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Merge pull request #11910 from mcav/fix-imap-literal-landing

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

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https://hg.mozilla.org/integration/gaia-central/rev/48ce6f7b2c9b
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Bug 901926 - [Email] Email app stops working if attachment contains an IMAP literal (fixed landing) r=asuth