update year programmatically (devcontainers#279)

Author: joshspicer

_includes/footer.html

@@ -30,7 +30,7 @@
                             <a id="footer-microsoft-link" class="logo" href="https://www.microsoft.com">
                                 <img src="{{site.baseurl}}/img/microsoft-logo-inverted.png" height="20" alt="Microsoft">
                             </a>
-                            <span>© 2022 Microsoft</span>
+                            <span>© {{ 'now' | date: "%Y" }} Microsoft</span>
                         </div>
                     </li>
                 </ul>