Bumping gaia.json for 1 gaia revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-central/rev/06ee4e4f4005
Author: Zac <zcampbell@mozilla.com>
Desc: Revert "Bug 968744 - Update test_receive_active_sync_email to check for incoming notification"

This reverts commit a9b1de0372de40835f42fb1d027f521ab8edfacb.
Bumping manifests a=b2g-bump