Bumping gaia.json for 1 gaia-central revision(s)

========

https://hg.mozilla.org/integration/gaia-central/rev/56e34384094a
Author: Rick Waldron <waldron.rick@gmail.com>
Desc: Bug 884639 - [SMS][MMS] Fix lint error caused by bug 875408 patch

https://bugzilla.mozilla.org/show_bug.cgi?id=884639

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>