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

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https://hg.mozilla.org/integration/gaia-central/rev/58c6ef2b02cc
Author: Julien Wajsberg <felash@gmail.com>
Desc: Merge pull request #13301 from julienw/931767-fix-test-only

Bug 931767 - fix tests for the DST change only r=rwaldron

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https://hg.mozilla.org/integration/gaia-central/rev/3cf768bd7d6d
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 931767 - fix tests for the DST change only r=rwaldron