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

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https://hg.mozilla.org/integration/gaia-central/rev/bb7c89814cf0
Author: Miller Medeiros <miller@millermedeiros.com>
Desc: Merge pull request #20717 from millermedeiros/1023784-offline-calendar-master

Bug 1023784 - [7715][calendar] create/modify/view event L10n r=gaye

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https://hg.mozilla.org/integration/gaia-central/rev/659422fec336
Author: Miller Medeiros <miller@millermedeiros.com>
Desc: Bug 1023784 - [7715][calendar] create/modify/view event L10n
Bumping manifests a=b2g-bump