Use try-with-resource to close resources

Closes gh-24807

spring-core/src/main/java/org/springframework/core/io/support/PropertiesLoaderUtils.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2020 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -182,8 +182,7 @@ public abstract class PropertiesLoaderUtils {
 			URL url = urls.nextElement();
 			URLConnection con = url.openConnection();
 			ResourceUtils.useCachesIfNecessary(con);
-			InputStream is = con.getInputStream();
-			try {
+			try (InputStream is = con.getInputStream()) {
 				if (resourceName.endsWith(XML_FILE_EXTENSION)) {
 					props.loadFromXML(is);
 				}
@@ -191,9 +190,6 @@ public abstract class PropertiesLoaderUtils {
 					props.load(is);
 				}
 			}
-			finally {
-				is.close();
-			}
 		}
 		return props;
 	}