Managed to update rustls to version 0.21

src/tcp_relay_server/mod.rs

@@ -121,7 +121,7 @@ pub async fn run_app(mut config: ServerConfig) -> std::io::Result<()> {
     });
 
     if let Some(tls_conf) = tls_config {
-        server.bind_rustls(&args.listen_address, tls_conf)?
+        server.bind_rustls_021(&args.listen_address, tls_conf)?
     } else {
         server.bind(&args.listen_address)?
     }