Bumping gaia.json for 1 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_3/rev/27ad93f7ad0f
Author: Miller Medeiros <miller@millermedeiros.com>
Desc: Bug 972666 - [Calendar] lines over events longer than 2 hours
Bumping manifests a=b2g-bump