update to spring 5, fix startup

spring-all/src/test/java/org/baeldung/spring43/attributeannotations/AttributeAnnotationConfiguration.java

@@ -6,13 +6,13 @@ import org.springframework.context.annotation.Configuration;
 import org.springframework.web.servlet.ViewResolver;
 import org.springframework.web.servlet.config.annotation.EnableWebMvc;
 import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
-import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
+import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
 import org.springframework.web.servlet.view.InternalResourceViewResolver;
 
 @Configuration
 @ComponentScan
 @EnableWebMvc
-public class AttributeAnnotationConfiguration extends WebMvcConfigurerAdapter {
+public class AttributeAnnotationConfiguration implements WebMvcConfigurer {
 
     @Bean
     public ViewResolver viewResolver() {