move construction of ConfigChangeEvent outside the lambda expression (#3398)

Author: wanghbxxxx

dubbo-configcenter/dubbo-configcenter-apollo/src/main/java/org/apache/dubbo/configcenter/support/apollo/ApolloDynamicConfiguration.java

@@ -176,11 +176,8 @@ public void onChange(com.ctrip.framework.apollo.model.ConfigChangeEvent changeEv
                     return;
                 }
 
-                listeners.forEach(listener -> {
-                            ConfigChangeEvent event = new ConfigChangeEvent(key, change.getNewValue(), getChangeType(change));
-                            listener.process(event);
-                        }
-                );
+                ConfigChangeEvent event = new ConfigChangeEvent(key, change.getNewValue(), getChangeType(change));
+                listeners.forEach(listener -> listener.process(event));
             }
         }