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

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https://hg.mozilla.org/integration/gaia-central/rev/f78c00034d8a
Author: Miller Medeiros <miller@millermedeiros.com>
Desc: Merge pull request #20143 from millermedeiros/1019617-week-view-am-pm

Bug 1019617 - [Calendar] Week View change sidebar design to fit am/pm on all locales r=gaye

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https://hg.mozilla.org/integration/gaia-central/rev/b88e19c9c9ae
Author: Miller Medeiros <miller@millermedeiros.com>
Desc: Bug 1019617 - [Calendar] Week View change sidebar design to fit am/pm on all locales
Bumping manifests a=b2g-bump