optimize: update end year

Signed-off-by: slievrly <slievrly@163.com>

Author: slievrly

NOTICE

@@ -1,5 +1,5 @@
 Apache Seata (Incubating)
-Copyright 2023-2025 The Apache Software Foundation
+Copyright 2023-2026 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).