update copyright string in mkdocs.yml

Author: picccard

mkdocs.yml

@@ -109,7 +109,7 @@ extra:
     repo_issue: https://github.com/silverhack/monkey365/issues
     repo_discussion: https://github.com/silverhack/monkey365/discussions
 
-copyright: Copyright &copy; 2023 <a href="https://twitter.com/tr1ana" target="blank">Juan Garrido</a>
+copyright: Copyright &copy; {year} <a href="https://twitter.com/tr1ana" target="blank">Juan Garrido</a>
 
 markdown_extensions:
   - admonition