Update docs to year 2026

Change-Id: I0834ce234c2f5e6f953fddd4aee34c8788895708
Reviewed-on: http://gerrit.cloudera.org:8080/23837
Reviewed-by: Alexey Serbin <alexey@apache.org>
Reviewed-by: Zoltan Chovan <zchovan@cloudera.com>
Tested-by: Abhishek Chennaka <achennaka@cloudera.com>

Author: Abhishek Chennaka

_includes/bottom_common.html

@@ -2,7 +2,7 @@
         <div class="row">
           <div class="col-md-9">
             <p class="small">
-            Copyright &copy; 2025 The Apache Software Foundation. {% if page.last_updated %} {{ page.last_updated }} {% endif %}
+            Copyright &copy; 2026 The Apache Software Foundation. {% if page.last_updated %} {{ page.last_updated }} {% endif %}
             </p>
             <p class="small">
             Apache Kudu, Kudu, Apache, the Apache feather logo, and the Apache Kudu