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

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https://hg.mozilla.org/integration/gaia-central/rev/6ae4f564465f
Author: James Lal <james@lightsofapollo.com>
Desc: Merge pull request #13211 from lightsofapollo/turn-on-hint-in-ci

Bug 932683 - Run jshint per commit but allow it to fail +shepherd

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https://hg.mozilla.org/integration/gaia-central/rev/bfb1ae49bd7c
Author: James Lal <james@lightsofapollo.com>
Desc: Bug 932683 - Run jshint per commit but allow it to fail +shepherd