HHH-14203 DB2 requires the restrict keyword to drop the schema

The 'restrict' keyword is required on DB2.

hibernate-core/src/main/java/org/hibernate/dialect/DB2Dialect.java

@@ -234,6 +234,11 @@ public class DB2Dialect extends Dialect {
 		return false;
 	}
 
+	@Override
+	public String[] getDropSchemaCommand(String schemaName) {
+		return new String[] {"drop schema " + schemaName + " restrict"};
+	}
+
 	@Override
 	public String getSequenceNextValString(String sequenceName) {
 		return "values nextval for " + sequenceName;