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

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https://hg.mozilla.org/integration/gaia-central/rev/60d2f438d6d1
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #13050 from mikehenrty/bug-930337-integration

Skip integration test "lockscreen > replace notification:"

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https://hg.mozilla.org/integration/gaia-central/rev/9227a6331163
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Skip integration test "lockscreen > replace notification:"