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

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https://hg.mozilla.org/integration/gaia-central/rev/6c02a36d8861
Author: Chris Lord <chrislord.net@gmail.com>
Desc: Merge pull request #25716 from kentaromiura/add-clearAllNotifications-effect

Bug 1092536 - Add a clear all notifications effect. r=cwiiis

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https://hg.mozilla.org/integration/gaia-central/rev/8eb8db5531ad
Author: kentaromiura <kentaromiura@gmail.com>
Desc: Bug 1092536 - Add an animation for clearing all notifications. r=cwiiis
Bumping manifests a=b2g-bump