Use dynamic year template in goheader template

Signed-off-by: Shinnosuke Sawada-Dazai <[email protected]>

Author: Warashi

.golangci.yml

@@ -53,7 +53,7 @@ linters-settings:
   goheader:
     # template does not contains the comment indicator '//' or '/*' '*/'
     template: |-
-      Copyright 2024 The PipeCD Authors.
+      Copyright {{mod-year-range}} The PipeCD Authors.
 
       Licensed under the Apache License, Version 2.0 (the "License");
       you may not use this file except in compliance with the License.