Attempt to prevent JarFiles from being left open

Update `JarFile` to also call `super.close()` early for nested jars.

See gh-21126

Author: philwebb

spring-boot-project/spring-boot-tools/spring-boot-loader/src/main/java/org/springframework/boot/loader/jar/JarFile.java

@@ -111,6 +111,7 @@ public JarFile(File file) throws IOException {
 	 */
 	JarFile(JarFile parent) throws IOException {
 		super(parent.rootFile.getFile());
+		super.close();
 		this.parent = parent;
 		this.rootFile = parent.rootFile;
 		this.pathFromRoot = parent.pathFromRoot;