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

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https://hg.mozilla.org/integration/gaia-central/rev/c9aa3de647fd
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #26997 from zbraniecki/1114907-notificationhelper-close-on-click

1114907 - By default, close NotificationHelper notifications on click r=kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/f4fb0e7f5d0a
Author: Zibi Braniecki <gandalf@mozilla.com>
Desc: 1114907 - By default, close NotificationHelper notifications on click
Bumping manifests a=b2g-bump