fix: Fix the compatible_upgrade_large_initial test

Equivalent of #2363 for `assert_dhcp`.

Author: larseggert

neqo-transport/src/connection/tests/vn.rs

@@ -284,6 +284,11 @@ fn compatible_upgrade_large_initial() {
     assert_eq!(client.stats().dropped_rx, 1);
     assert!(matches!(server.stats().dropped_rx, 2 | 3));
     assert_dscp(&client.stats());
+    assert!(
+        server.stats().dscp_rx[IpTosDscp::Cs0] == server.stats().packets_rx
+            || server.stats().dscp_rx[IpTosDscp::Cs0] == server.stats().packets_rx + 1
+    );
+
     assert_dscp(&server.stats());
 }