Bumping gaia.json for 2 gaia-central revision(s)

========

https://hg.mozilla.org/integration/gaia-central/rev/792d8e9a8172
Author: James Lal <james@lightsofapollo.com>
Desc: Merge pull request #11994 from lightsofapollo/marionette-vbump-15

 marionette vbump

========

https://hg.mozilla.org/integration/gaia-central/rev/ea80092122da
Author: James Lal <james@lightsofapollo.com>
Desc: marionette vbump