Updating the carbon-device-mgt version

This upgrade has api changes due to fixes to the policy monitoring

src/test/java/org/wso2/extension/siddhi/device/test/util/TestDeviceManagementService.java

@@ -25,6 +25,7 @@ import org.wso2.carbon.device.mgt.common.MonitoringOperation;
 import org.wso2.carbon.device.mgt.common.OperationMonitoringTaskConfig;
 import org.wso2.carbon.device.mgt.common.ProvisioningConfig;
 import org.wso2.carbon.device.mgt.common.app.mgt.ApplicationManager;
+import org.wso2.carbon.device.mgt.common.general.GeneralConfig;
 import org.wso2.carbon.device.mgt.common.policy.mgt.PolicyMonitoringManager;
 import org.wso2.carbon.device.mgt.common.pull.notification.PullNotificationSubscriber;
 import org.wso2.carbon.device.mgt.common.push.notification.PushNotificationConfig;
@@ -108,4 +109,9 @@ public class TestDeviceManagementService implements DeviceManagementService {
     public DeviceStatusTaskPluginConfig getDeviceStatusTaskPluginConfig() {
         return null;
     }
+
+    @Override
+    public GeneralConfig getGeneralConfig() {
+        return null;
+    }
 }