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

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https://hg.mozilla.org/integration/gaia-central/rev/73a4dfee4833
Author: James Lal <james@lightsofapollo.com>
Desc: Merge pull request #11686 from lightsofapollo/fix-integration

Bug 908092 - Fix regression caused by ./bin/marionette change in 612e786...

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https://hg.mozilla.org/integration/gaia-central/rev/e9edf10912c5
Author: James Lal <james@lightsofapollo.com>
Desc: Bug 908092 - Fix regression caused by ./bin/marionette change in 612e786f22dc1deb31489facdd0ae633440109ba