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

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https://hg.mozilla.org/integration/gaia-central/rev/8ff194bcc867
Author: Miller Medeiros <miller@millermedeiros.com>
Desc: Merge pull request #19692 from millermedeiros/1013096-hard-coded-date-structures

Bug 1013096 - [Calendar] Month View: don't hard-code date structures r=evanxd

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https://hg.mozilla.org/integration/gaia-central/rev/a30bd377ef80
Author: Miller Medeiros <miller@millermedeiros.com>
Desc: Bug 1013096 - [Calendar] Month View: don't hard-code date structures
Bumping manifests a=b2g-bump