Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-central/rev/ab48cd170930
Author: Gareth Aye <gaye@mozilla.com>
Desc: Merge pull request #21277 from gaye/calendar-server-test-calendar-or-user-name

Allow username to be different from calendar name in server tests

========

https://hg.mozilla.org/integration/gaia-central/rev/004d82be3f8e
Author: gaye <gaye@mozilla.com>
Desc: Allow username to be different from calendar name in server tests

========

https://hg.mozilla.org/integration/gaia-central/rev/341fe9c32e28
Author: Gabriele Svelto <gsvelto@mozilla.com>
Desc: Bug 1016885 - Send a notification instead of displaying the dialer when receiving an unsolicited USSD notification r=etienne
Bumping manifests a=b2g-bump