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

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https://hg.mozilla.org/integration/gaia-central/rev/186e5f04086d
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Merge pull request #17559 from mcav/1.3-uplift

Bug 981255 - [Sora][MMI]Alarm display abnormally when unlock screen. r=millermedeiros

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https://hg.mozilla.org/integration/gaia-central/rev/bc46f1a1b478
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Bug 981255 - [Sora][MMI]Alarm display abnormally when unlock screen. r=millermedeiros
Bumping manifests a=b2g-bump