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

========

https://hg.mozilla.org/integration/gaia-central/rev/1c060e378a4f
Author: Amir Nissim <amirnissim@gmail.com>
Desc: Merge pull request #17781 from EverythingMe/989722-dnd-cleanup

Bug 989722 - Draggable element in Collection is not cleared after dragen...

========

https://hg.mozilla.org/integration/gaia-central/rev/9c181c0b7977
Author: Amir Nissim <amirnissim@gmail.com>
Desc: Bug 989722 - Draggable element in Collection is not cleared after dragend [r=ranbena]
Bumping manifests a=b2g-bump