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

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https://hg.mozilla.org/integration/gaia-central/rev/2ba34e93a4be
Author: Miller Medeiros <miller@millermedeiros.com>
Desc: Merge pull request #18561 from millermedeiros/987427-notification-rounding

Bug 987427 - [B2G][Calendar] Notifications for calendar alarms set for 2 hours before the event are incorrect r=gaye r=stas

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https://hg.mozilla.org/integration/gaia-central/rev/fabc5f25398b
Author: Miller Medeiros <miller@millermedeiros.com>
Desc: Bug 987427 - [B2G][Calendar] Notifications for calendar alarms set for 2 hours before the event are incorrect
Bumping manifests a=b2g-bump