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

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https://hg.mozilla.org/integration/gaia-central/rev/5c08f3d8a2b9
Author: James Lal <james@lightsofapollo.com>
Desc: Merge pull request #11131 from lightsofapollo/bug-876788

Bug 876788 - Fix bug where Caldav Provider fired syncEvents sync instead...

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https://hg.mozilla.org/integration/gaia-central/rev/80276e7f6acc
Author: James Lal <james@lightsofapollo.com>
Desc: Bug 876788 - Fix bug where Caldav Provider fired syncEvents sync instead of async