Merge pull request #12452 from igor-suhorukov

* pr/12452:
  "toString()" should never be called on a String object

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/web/mappings/servlet/DispatcherServletsMappingDescriptionProvider.java

@@ -168,7 +168,7 @@ public class DispatcherServletsMappingDescriptionProvider
 
 		private DispatcherServletMappingDescription describe(
 				Entry<String, Object> mapping) {
-			return new DispatcherServletMappingDescription(mapping.getKey().toString(),
+			return new DispatcherServletMappingDescription(mapping.getKey(),
 					mapping.getValue().toString(), null);
 		}