HHH-10946 - Fix checkstyle failures

(cherry picked from commit 2246e94ded)

hibernate-testing/src/main/java/org/hibernate/testing/jdbc/JdbcProperties.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.jdbc;
 
 import java.io.IOException;

hibernate-testing/src/main/java/org/hibernate/testing/jdbc/leak/ConnectionLeakException.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.jdbc.leak;
 
 /**

hibernate-testing/src/main/java/org/hibernate/testing/jdbc/leak/IdleConnectionCounter.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.jdbc.leak;
 
 import java.sql.Connection;