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

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https://hg.mozilla.org/integration/gaia-central/rev/70a08d663711
Author: Julien Wajsberg <felash@gmail.com>
Desc: Merge pull request #15582 from julienw/952302-fix-gesture-mock

Bug 952302 - [Messages] We need to load the gesture detector mock from S...

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https://hg.mozilla.org/integration/gaia-central/rev/414dacd7a58b
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 952302 - [Messages] We need to load the gesture detector mock from SMS or shared r=etienne,rwaldron
Bumping manifests a=b2g-bump