SEC-2651: Fix hellojs-jc after Thymeleaf Spring 4 changes

samples/hellojs-jc/src/main/java/org/springframework/security/samples/mvc/config/CustomMvcConfig.java

@@ -18,8 +18,8 @@ package org.springframework.security.samples.mvc.config;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.core.Ordered;
-import org.thymeleaf.spring3.SpringTemplateEngine;
-import org.thymeleaf.spring3.view.ThymeleafViewResolver;
+import org.thymeleaf.spring4.SpringTemplateEngine;
+import org.thymeleaf.spring4.view.ThymeleafViewResolver;
 
 /**
  * Disable tiles so that we can provide our custom view without being decorated.