Bump copyright year

Author: strugee

src/includes/footer.pug

@@ -1,6 +1,6 @@
 footer
 	p You may find the source code for this website, licensed to you under the GNU Affero GPL, <a rel="license" href="https://github.com/strugee/strugee.github.com">on GitHub</a>. English copy is additionally licensed under <a rel="license" href="https://creativecommons.org/licenses/by-sa/4.0/">Creative Commons BY-SA 4.0</a>.
-	p &copy; Copyright 2012-2023 AJ Jordan.
+	p &copy; Copyright 2012-2024 AJ Jordan.
 
 // Piwik
 // Note that this Piwik instance is self-hosted and so doesn't leak metadata. Also, critically, it respects Do Not Track.