Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/f6ec7e24a354
Author: evanxd <itoyxd@gmail.com>
Desc: Merge pull request #20682 from evanxd/bug-1023807

Bug 1023807 - Mark all dates of duration of an event in month view

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https://hg.mozilla.org/integration/gaia-central/rev/62e3a0af71a5
Author: Evan Xd <itoyxd@gmail.com>
Desc: Bug 1023807 - Add unit/marionette tests

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https://hg.mozilla.org/integration/gaia-central/rev/cad2b780563d
Author: deepak.k.mishra <deepak.k.mishra@accenture.com>
Desc: Bug 1023807 - [B2G][Calendar] Month view: Dot does not appears when event cross couple of days
Bumping manifests a=b2g-bump