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

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https://hg.mozilla.org/integration/gaia-central/rev/b1cfff59ca24
Author: James Lal <james@lightsofapollo.com>
Desc: Merge pull request #10229 from lightsofapollo/hide-loading-area

Bug 876796 - Hide event details until they are loaded.

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https://hg.mozilla.org/integration/gaia-central/rev/ebdf2b0e30b2
Author: James Lal <james@lightsofapollo.com>
Desc: Bug 876796 - Hide show event / edit event details until model is loaded