cmd/devp2p/internal/ethtest: add support for eth/68 (#26078)

Co-authored-by: Felix Lange <fjl@twurst.com>

cmd/devp2p/internal/ethtest/helpers.go

@@ -63,8 +63,9 @@ func (s *Suite) dial() (*Conn, error) {
 	conn.caps = []p2p.Cap{
 		{Name: "eth", Version: 66},
 		{Name: "eth", Version: 67},
+		{Name: "eth", Version: 68},
 	}
-	conn.ourHighestProtoVersion = 67
+	conn.ourHighestProtoVersion = 68
 	return &conn, nil
 }
 
@@ -359,6 +360,8 @@ func (s *Suite) waitAnnounce(conn *Conn, blockAnnouncement *NewBlock) error {
 			return nil
 
 		// ignore tx announcements from previous tests
+		case *NewPooledTransactionHashes66:
+			continue
 		case *NewPooledTransactionHashes:
 			continue
 		case *Transactions: