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

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https://hg.mozilla.org/integration/gaia-central/rev/79a154658ac1
Author: James Lal <james@lightsofapollo.com>
Desc: Merge pull request #13101 from lightsofapollo/vbump-marionette-1.0.0

NO BUG - vbump marionette a=test-only

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https://hg.mozilla.org/integration/gaia-central/rev/a186a56904a6
Author: James Lal <james@lightsofapollo.com>
Desc: NO BUG - vbump marionette a=test-only