zeroconf_bonjour can not resolve services over IPv6
On my IPv6-only network, Gajim on Linux can see Gajim on MacOS, but not the other way around.
I think this is because in service_resolved_callback(), the call to pybonjour.DNSServiceQueryRecord() only asks for pybonjour.kDNSServiceType_A, while for IPv6 we need pybonjour.kDNSServiceType_AAAA.
The respective bit in the Avahi code seem to get the protocol as an argument in new_service_callback(), but I can't find this in the Bonjour code.