remove useless import

spring-cloud-tencent-examples/polaris-config-example/src/main/java/com/tencent/cloud/polaris/config/example/ConfigController.java

@@ -18,7 +18,6 @@ package com.tencent.cloud.polaris.config.example;
 
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.annotation.Value;
-import org.springframework.cloud.context.config.annotation.RefreshScope;
 import org.springframework.core.env.Environment;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.RestController;