RequestPartMethodArgumentResolver declares @UsesJava8 now

Issue: SPR-12644

spring-webmvc/src/main/java/org/springframework/web/servlet/mvc/method/annotation/RequestPartMethodArgumentResolver.java

@@ -29,6 +29,7 @@ import org.springframework.core.MethodParameter;
 import org.springframework.core.annotation.AnnotationUtils;
 import org.springframework.http.HttpInputMessage;
 import org.springframework.http.converter.HttpMessageConverter;
+import org.springframework.lang.UsesJava8;
 import org.springframework.util.Assert;
 import org.springframework.validation.BindingResult;
 import org.springframework.validation.Errors;
@@ -112,6 +113,7 @@ public class RequestPartMethodArgumentResolver extends AbstractMessageConverterM
 	}
 
 	@Override
+	@UsesJava8
 	public Object resolveArgument(MethodParameter parameter, ModelAndViewContainer mavContainer,
 			NativeWebRequest request, WebDataBinderFactory binderFactory) throws Exception {