ICMP on IPv6 with Addresses doesn't really work

Hi,

IPv6 adresses, unlike IPv4, can have letters (a to f) in them. Currently (5.36.0), it is not really possible to use ICMP with IPv6:

icmp://[2a07:6b44:27:11::ac] => gatus starts, but no pings for this endpoint are performed.

icmp://2a07:6b44:27:11::ac => gatus refuses to start, interpreting the ac part of the address as a invalid port number

icmp://[2a07:6b44:27:11::21] => gatus starts and no pings are performed.

icmp://2a07:6b44:27:11::21 => gatus starts and pings are performed.

I'm wondering why address handling is a problem, I haven't looked at the code yet, but I would expect that there's a golang module to use that does evertyhing right.

Regards, Daniel