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

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https://hg.mozilla.org/integration/gaia-central/rev/52b4de49a255
Author: Miller Medeiros <miller@millermedeiros.com>
Desc: Merge pull request #20695 from millermedeiros/1026924-current-time

Bug 1026924 - [Flame][Calendar] Current time indicator should be above event detail r=gaye

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https://hg.mozilla.org/integration/gaia-central/rev/e6db7b53bd50
Author: Miller Medeiros <miller@millermedeiros.com>
Desc: Bug 1026924 - [Flame][Calendar] Current time indicator should be above event detail
Bumping manifests a=b2g-bump