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

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https://hg.mozilla.org/integration/gaia-central/rev/2f69a4a2dad7
Author: Rick Waldron <waldron.rick@gmail.com>
Desc: Bug 952591 - [Messages] Selecting 'Send email' from a message that contains an email address does not launch Email app. r=julienw

https://bugzilla.mozilla.org/show_bug.cgi?id=952591
Signed-off-by: Rick Waldron <waldron.rick@gmail.com>