Update qbs submodule.

To the head of the 1.1 branch.

Change-Id: I83af4c448c1f57f505849a6cd6a79c08f5d9b8a0
Reviewed-by: Eike Ziller <eike.ziller@digia.com>
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>