[Website] Update copyright year in the global footer (#24657)

diff --git a/docs/website/mkdocs.yml b/docs/website/mkdocs.yml
index 83f4dc5..6af803f 100644
--- a/docs/website/mkdocs.yml
+++ b/docs/website/mkdocs.yml

@@ -83,7 +83,7 @@
   **/snippets/*.md
 
 copyright: |
-  Copyright &copy; 2025 IREE a Series of LF Projects, LLC.
+  Copyright &copy; 2026 IREE a Series of LF Projects, LLC.
   For web site terms of use, trademark policy and other project policies please
   see <a href="https://lfprojects.org">https://lfprojects.org</a>.