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

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https://hg.mozilla.org/integration/gaia-central/rev/ea43288e7fa3
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #13634 from mikehenrty/bug-936485-marionette-bump

bumping marionette client, increase waitFor timeout, r=lightsofapollo

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https://hg.mozilla.org/integration/gaia-central/rev/9bd54d12ba10
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: bumping marionette client, increase waitFor timeout