Update logging level path

spring-cloud-alibaba-examples/nacos-example/nacos-config-preference-example/src/main/resources/application.yml

@@ -18,7 +18,7 @@ spring:
 logging:
   level:
     # print content
-    org.springframework.boot.context.config: debug
+    com.alibaba.cloud.nacos.configdata: debug
 ---
 spring:
   config:

spring-cloud-alibaba-starters/spring-cloud-starter-alibaba-nacos-config/src/main/java/com/alibaba/cloud/nacos/configdata/NacosConfigDataLoader.java

@@ -34,6 +34,7 @@ import org.springframework.boot.context.config.ConfigData;
 import org.springframework.boot.context.config.ConfigDataLoader;
 import org.springframework.boot.context.config.ConfigDataLoaderContext;
 import org.springframework.boot.context.config.ConfigDataResourceNotFoundException;
+import org.springframework.boot.context.properties.bind.Binder;
 import org.springframework.boot.logging.DeferredLogFactory;
 import org.springframework.core.env.PropertySource;