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

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https://hg.mozilla.org/integration/gaia-2_0/rev/3720df5fe83d
Author: Alive.Kuo <alegnadise@gmail.com>
Desc: Merge pull request #21378 from alivedise/bugzilla/1030415_v2.0/app-home-race

Bug 1030415 - Use lockscreen-request-unlock to show homescreen or app, r=timdream

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https://hg.mozilla.org/integration/gaia-2_0/rev/6c78340590c2
Author: Alive Kuo <alegnadise@gmail.com>
Desc: Bug 1030415 - Use lockscreen-request-unlock to show homescreen or app
Bumping manifests a=b2g-bump