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

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https://hg.mozilla.org/integration/gaia-central/rev/085648d44f2a
Author: James Lal <james@lightsofapollo.com>
Desc: Merge pull request #11615 from lightsofapollo/vbump-tst-agent2

vbump test-agent

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https://hg.mozilla.org/integration/gaia-central/rev/115cdfae223a
Author: James Lal <james@lightsofapollo.com>
Desc: Bug 899725 - vbump test-agent