Update NOTICE for the year

Signed-off-by: Matt Ray <github@mattray.dev>

NOTICE

@@ -1,5 +1,5 @@
 OpenCost
-Copyright 2022 Cloud Native Computing Foundation
+Copyright 2022 - 2023 Cloud Native Computing Foundation
 
 This product includes software developed at
 The Cloud Native Computing Foundation (http://www.cncf.io).