Indeed. Like explained here -> Introducing Pi-hole v6
Pi-hole does not need lighthttp or apache to serve its webpages. It now serves them via an "internal" http server, leveraging lua instead of PHP to show "dynamic" content.
So if something (lighthttp or apache) was running on port 80 while doing the update, pi-hole will start listening on port 8080 and you should visit http://pi.hole:8080/admin to find the admin pages.