Bumping gaia.json for 4 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/ad8ba24e8f3f
Author: Fabien Cazenave <fabien@cazenave.cc>
Desc: Merge pull request #12061 from lissyx/bug913421

Bug 913421 - Handle FDN status in Messages app, r=steveck

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https://hg.mozilla.org/integration/gaia-central/rev/41d0d1228de5
Author: Alexandre Lissy <lissyx+github@lissyx.dyndns.org>
Desc: Bug 913421 - Handle FDN status in Messages app

Adding FDN handling when sending SMS, notifying the user when one or
more (in case of multiple recipients) FDN blocked numbers.

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https://hg.mozilla.org/integration/gaia-central/rev/15c3836bd860
Author: Andrew Sutherland <asutherland@asutherland.org>
Desc: Merge pull request #12109 from asutherland/fix-attachment-icon

Bug 912525 - [Email] Attachment icon missing in inbox from incoming email. r=jrburke

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https://hg.mozilla.org/integration/gaia-central/rev/9a6b97ca6f6e
Author: Andrew Sutherland <asutherland@asutherland.org>
Desc: Bug 912525 - [Email] Attachment icon missing in inbox from incoming email. r=jrburke