Use try-with-resources language construct where feasible

Closes gh-2063

Co-authored-by: igor-suhorukov <igor.suhorukov@gmail.com>

spring-orm/src/main/java/org/springframework/orm/jpa/persistenceunit/PersistenceUnitReader.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 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.
@@ -130,14 +130,10 @@ final class PersistenceUnitReader {
 				Resource[] resources = this.resourcePatternResolver.getResources(location);
 				for (Resource resource : resources) {
 					resourceLocation = resource.toString();
-					InputStream stream = resource.getInputStream();
-					try {
+					try (InputStream stream = resource.getInputStream()) {
 						Document document = buildDocument(handler, stream);
 						parseDocument(resource, document, infos);
 					}
-					finally {
-						stream.close();
-					}
 				}
 			}
 		}