Hello OpenBSD ports team,

I am using caddy-2.11.4 to act as a simple http server and reverse proxy 
for some services in my home network.

I have both IPv4 and IPv6 support from my ISP and I have enabled IPv6 on 
on the OpenBSD machine. My issue is that caddy refuses to bind to any 
IPv6 interface/address. If I try to bind, for example, port 443 with nc 
it listens on it just fine. I tried binding a static response with `bind 
[::]` on port 8888, but it still refuses to bind.

Here is an example of my Caddyfile with info redacted:


```
##### OPTIONS #####

{
     metrics {
         per_host
         observe_catchall_hosts
     }
     log {
         output file /var/log/caddy/caddy.log
         format json {
             time_format rfc3339
         }
     }
     email admin@example.com
}
(robots) {
     route /robots.txt {
         root * /var/www/my.website/robots/
         file_server
     }
}

##### SERVICES #####
service1.my.website {
     import robots
     reverse_proxy 192.168.1.2 {
         header_up X-Real-Ip {remote_host}
     }
     log {
         output file /var/log/caddy/service1.my.website.log
         format json {
             time_format rfc3339
         }

     }
}

my.website {
     import robots
     root * /var/www/my.website/default/
     file_server
     log {
         output file /var/log/caddy/my.website.log
         format json {
             time_format rfc3339
         }

     }
}

```


Thanks for your time