bump copyright date

Author: briandfoy

lib/PerlPowerTools.pm

@@ -270,7 +270,7 @@ though he wrote none of the utilities.
 
 =head1 COPYRIGHT AND LICENSE
 
-Copyright © 2004-2022 by various authors. See each program for
+Copyright © 2004-2023 by various authors. See each program for
 specific information.
 
 This program is free software; you can redistribute it and/or modify