update license year

Author: jmckenna

README.rst

@@ -69,7 +69,7 @@ License
 
 ::
 
-  Copyright (c) 2008-2021 Open Source Geospatial Foundation.
+  Copyright (c) 2008-2024 Open Source Geospatial Foundation.
   Copyright (c) 1996-2008 Regents of the University of Minnesota.
 
   Permission is hereby granted, free of charge, to any person obtaining a copy