Fix SecurityManager deprecation issues

See gh-32086

Author: philwebb

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

@@ -128,9 +128,7 @@ private JarFile(RandomAccessDataFile rootFile, String pathFromRoot, RandomAccess
 	private JarFile(RandomAccessDataFile rootFile, String pathFromRoot, RandomAccessData data, JarEntryFilter filter,
 			JarFileType type, Supplier<Manifest> manifestSupplier) throws IOException {
 		super(rootFile.getFile());
-		if (System.getSecurityManager() == null) {
-			super.close();
-		}
+		super.close();
 		this.rootFile = rootFile;
 		this.pathFromRoot = pathFromRoot;
 		CentralDirectoryParser parser = new CentralDirectoryParser();

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

@@ -40,9 +40,7 @@ class JarFileWrapper extends AbstractJarFile {
 	JarFileWrapper(JarFile parent) throws IOException {
 		super(parent.getRootJarFile().getFile());
 		this.parent = parent;
-		if (System.getSecurityManager() == null) {
-			super.close();
-		}
+		super.close();
 	}
 
 	@Override