Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/564a1b8123b3
Author: Gareth Aye <gaye@mozilla.com>
Desc: Merge pull request #18872 from millermedeiros/951071-week-view-visual-refresh

Bug 951071- [Calendar] Week View_1.4 Visual Refresh r=gaye

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https://hg.mozilla.org/integration/gaia-central/rev/9736a515068d
Author: Miller Medeiros <miller@millermedeiros.com>
Desc: Bug 951071- [Calendar] Week View_1.4 Visual Refresh

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https://hg.mozilla.org/integration/gaia-central/rev/a0f35d28077e
Author: Gareth Aye <gaye@mozilla.com>
Desc: Merge pull request #19499 from millermedeiros/1013120-month-colors

Bug 1013120 - [B2G][Calendar] Month View: should use calendar colors for dots and alarm icons r=gaye

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https://hg.mozilla.org/integration/gaia-central/rev/88114ddf75c5
Author: Miller Medeiros <miller@millermedeiros.com>
Desc: Bug 1013120 - [B2G][Calendar] Month View: should use calendar colors for dots and alarm icons
Bumping manifests a=b2g-bump