build: bump year (#32608)

Happy New Year! 🎉

Author: crisbeto

LICENSE

@@ -1,6 +1,6 @@
 The MIT License
 
-Copyright (c) 2025 Google LLC.
+Copyright (c) 2026 Google LLC.
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal