fix: test case

Author: handewo

russh/src/tests.rs

@@ -526,6 +526,7 @@ mod channels {
 
         impl server::Handler for ServerHandle {
             type Error = crate::Error;
+            type Data = ();
 
             async fn auth_publickey(
                 &mut self,
@@ -1331,6 +1332,7 @@ mod future_certificate {
 
             impl server::Handler for CertHandler {
                 type Error = crate::Error;
+                type Data = ();
 
                 async fn auth_publickey_offered(
                     &mut self,