update copyright date

Author: dbaileychess

docs/mkdocs.yml

@@ -4,7 +4,7 @@ site_url: https://flatbuffers.dev
 repo_name: google/FlatBuffers
 repo_url: https://github.com/google/flatbuffers
 edit_uri: edit/master/docs/source/
-copyright: Copyright © 2024 Google
+copyright: Copyright © 2025 Google
 theme:
   name: material
   logo: assets/flatbuffers_logo.svg

docs/overrides/404.html

@@ -8,4 +8,4 @@ <h1>404 - Not found</h1>
   links may not work. 
 
   Please <a href="https://github.com/google/flatbuffers/issues/new?template=404-doc.md">file an issue</a> indicating the broken link.
-  {% endblock %}
+{% endblock %}