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

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https://hg.mozilla.org/integration/gaia-central/rev/c195232a409e
Author: Julien Wajsberg <felash@gmail.com>
Desc: Merge pull request #16738 from julienw/976454-no-provider-error

Bug 976454 - [Sora][Message][MMS]The prompt message is wrong when re-ent...

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https://hg.mozilla.org/integration/gaia-central/rev/95ab69aa24b6
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 976454 - [Sora][Message][MMS]The prompt message is wrong when re-enter message r=schung

When invoking an activity, we show the "no provider" message only when we
receive this specific error.
Bumping manifests a=b2g-bump