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

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https://hg.mozilla.org/integration/gaia-central/rev/862e55fbf138
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #13932 from eeejay/bug-941967

Bug 941967 - Fix checkbox position in modify event screen. Regression from bug #914892. r=kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/8a43ff3bde4f
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Bug 941967 - Fix checkbox position in modify event screen. Regression from bug #914892.