String buffer overflow on status for long forge modlists

[chloeruka]

I'm running an Enigmatica6 server on Forge 1.16.5. FML2 handshakes grow linearly with the mod list as they use it to confirm client compatibility:

❯ docker run -it -e DEBUG=true --rm itzg/mc-monitor status --host [REDACTED] --port 25565
2022-09-20T13:10:25.277Z        DEBUG   mc-monitor/java_status.go:76    pinging
2022-09-20T13:10:25.435Z        DEBUG   mc-monitor/java_status.go:79    ping returned   {"error": "string length out of bounds", "info": null}
failed to ping [REDACTED]:25565 : string length out of bounds%

After flushing this one out for a while, it seems to be that once the handshake reply is beyond math.MaxInt16 or 65535 bytes, mc-pinger breaks and returns a slightly nebulous error. This makes my LivenessProbe fail and I want to use mc-monitor if I can. 😄

I'm mostly writing this issue as documentation of this quirk in case it saves another time-poor weekend server op some time. I have a quick and dirty way of fixing this issue, but it does involve a slightly less obvious change in a forthcoming PR. I'll also try to relay this upstream in case @raqbit feels up to tackling it or can direct us where to help out, though it appears there's some refactoring work that might need to be done.