package/python-bluezero: depends on dbus-python and python-gobject

As of version 0.4.0 observer.py uses dbus-python (to comunicate with BlueZ)
instead of python-aioblescan. Thus, all modules now depend on dbus-python.

Signed-off-by: Grzegorz Blach <grzegorz@blach.pl>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>