Make classes final where possible

Update classes that have private constructors so that they are also
declared final. In a few cases, inner-classes used private constructors
but were subclassed. These have now been changed to have package-private
constructors.

Issue gh-8945

acl/src/test/java/org/springframework/security/acls/jdbc/JdbcMutableAclServiceTests.java

@@ -550,7 +550,7 @@ public class JdbcMutableAclServiceTests extends AbstractTransactionalJUnit4Sprin
 	 */
 	private class CustomJdbcMutableAclService extends JdbcMutableAclService {
 
-		private CustomJdbcMutableAclService(DataSource dataSource, LookupStrategy lookupStrategy, AclCache aclCache) {
+		CustomJdbcMutableAclService(DataSource dataSource, LookupStrategy lookupStrategy, AclCache aclCache) {
 			super(dataSource, lookupStrategy, aclCache);
 		}