[qtbase] Fix expected signature from connman Scan method. Fixes JB#40647

Have been getting errors on app startup:
Unexpected reply signature: got \"\", expected \"a{sv}\"

Connman technology interface documents Scan as void, results
gotten with other api.

src/plugins/bearer/connman/qconnmanservice_linux.cpp

@@ -500,7 +500,7 @@ void QConnmanTechnologyInterface::scan()
 
 void QConnmanTechnologyInterface::scanReply(QDBusPendingCallWatcher *call)
 {
-    QDBusPendingReply<QVariantMap> props_reply = *call;
+    QDBusPendingReply<void> props_reply = *call;
     if (props_reply.isError()) {
         qDebug() << props_reply.error().message();
     }