HHH-18675: Changed license to 6.6 version

(cherry picked from commit 0a1a9f7)

# Conflicts:
#	hibernate-core/src/main/java/org/hibernate/metamodel/internal/MetadataContext.java

Author: leonschenk

hibernate-core/src/test/java/org/hibernate/orm/test/manytomany/generic/ManyToManyGenericTest.java

@@ -1,6 +1,8 @@
 /*
- * SPDX-License-Identifier: LGPL-2.1-or-later
- * Copyright Red Hat Inc. and Hibernate Authors
+ * 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.orm.test.manytomany.generic;
 

hibernate-core/src/test/java/org/hibernate/orm/test/manytomany/generic/ManyToManyNonGenericTest.java

@@ -1,6 +1,8 @@
 /*
- * SPDX-License-Identifier: LGPL-2.1-or-later
- * Copyright Red Hat Inc. and Hibernate Authors
+ * 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.orm.test.manytomany.generic;