Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-central/rev/3d467f400b90
Author: Hubert Figuière <hub@figuiere.net>
Desc: Merge pull request #15699 from hfiguiere/bug962040-fixes

Bug 962040 - Require marionette-device-host 0.0.2 to avoid spurious stdout output r=julienw

========

https://hg.mozilla.org/integration/gaia-central/rev/fb8823dd0489
Author: Hubert Figuière <hub@figuiere.net>
Desc: Bug 962040 - Require marionette-device-host 0.0.2 to avoid spurious stdout output
Bumping manifests a=b2g-bump