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

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https://hg.mozilla.org/integration/gaia-central/rev/3c80024a0f45
Author: James Lal <james@lightsofapollo.com>
Desc: Merge pull request #13716 from mikehenrty/bug-937955-marionette-client

Bug 937955 - use marionette client with bigger timeouts

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https://hg.mozilla.org/integration/gaia-central/rev/f4bc3b75df58
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Bug 937955 - use marionette client with bigger timeouts