fix class-b RFC1918 network

[ctr49]

I'm pretty sure this should be 192.168.0.0/16, not 192.128.0.0/16 as per RFC1918. Nothing against AT&T (who own 192.128.0.0/16)...

[sandhose]

Good catch! Indeed, nothing against AT&T :)

This file is generated though, so you'd need to update the IP here:

matrix-authentication-service/crates/config/src/sections/http.rs

Line 68 in 19fab3c

IpNetwork::new([192, 128, 0, 0].into(), 16).unwrap(),

And then run sh misc/update.sh (or just cargo run -p mas-config > ./docs/config.schema.json if you don't have a full dev environment working. This only requires cargo/rust to be installed)