Logger class is incorrect. (#3054)

oap-server/server-receiver-plugin/skywalking-register-receiver-plugin/src/main/java/org/apache/skywalking/oap/server/receiver/register/provider/handler/v6/grpc/RegisterServiceHandler.java

@@ -31,7 +31,6 @@ import org.apache.skywalking.oap.server.core.register.service.*;
 import org.apache.skywalking.oap.server.core.source.DetectPoint;
 import org.apache.skywalking.oap.server.library.module.ModuleManager;
 import org.apache.skywalking.oap.server.library.server.grpc.GRPCHandler;
-import org.apache.skywalking.oap.server.receiver.register.provider.handler.v5.grpc.InstanceDiscoveryServiceHandler;
 import org.slf4j.*;
 
 import static org.apache.skywalking.oap.server.core.register.ServiceInstanceInventory.PropertyUtil.*;
@@ -41,7 +40,7 @@ import static org.apache.skywalking.oap.server.core.register.ServiceInstanceInve
  */
 public class RegisterServiceHandler extends RegisterGrpc.RegisterImplBase implements GRPCHandler {
 
-    private static final Logger logger = LoggerFactory.getLogger(InstanceDiscoveryServiceHandler.class);
+    private static final Logger logger = LoggerFactory.getLogger(RegisterServiceHandler.class);
 
     private final ServiceInventoryCache serviceInventoryCache;
     private final ServiceInstanceInventoryCache serviceInstanceInventoryCache;