Fix issue with incorrect class import

Issue: SPR-9112

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

@@ -18,6 +18,7 @@ package org.springframework.web.servlet.mvc.method.annotation;
 
 import java.lang.reflect.Method;
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.LinkedHashMap;
 import java.util.List;
@@ -58,8 +59,6 @@ import org.springframework.web.servlet.ModelAndView;
 import org.springframework.web.servlet.View;
 import org.springframework.web.servlet.handler.AbstractHandlerMethodExceptionResolver;
 
-import edu.emory.mathcs.backport.java.util.Collections;
-
 /**
  * An {@link AbstractHandlerMethodExceptionResolver} that resolves exceptions
  * through {@code @ExceptionHandler} methods.