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

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https://hg.mozilla.org/integration/gaia-central/rev/4e8dc46f1c1e
Author: James Lal <james@lightsofapollo.com>
Desc: Merge pull request #11469 from KevinGrandon/bug_903652_calendar_swiping

Bug 903652 - Add delayed transition visibility for tooltip

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https://hg.mozilla.org/integration/gaia-central/rev/7c19afa8af95
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 903652 - Add delayed transition visibility for tooltip