Merge pull request #21448 from apache/bot/update-notice-year/2026

chore: update NOTICE year to 2026

Author: plainheart

NOTICE

@@ -1,5 +1,5 @@
 Apache ECharts
-Copyright 2017-2025 The Apache Software Foundation
+Copyright 2017-2026 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (https://www.apache.org/).