HHH-10654 - Fix checkstyle error

hibernate-testing/src/main/java/org/hibernate/testing/util/ExceptionUtil.java

@@ -1,3 +1,9 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * License: GNU Lesser General Public License (LGPL), version 2.1 or later.
+ * See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
+ */
 package org.hibernate.testing.util;
 
 import javax.persistence.LockTimeoutException;