Avoid deprecated ndn-cxx type aliases

Change-Id: I68c202f2a788491b9d3d6d2f68adefdeefb3beb5
diff --git a/tests/unit-tests/bench.t.cpp b/tests/unit-tests/bench.t.cpp
index 2a97b2c..9f30470 100644
--- a/tests/unit-tests/bench.t.cpp
+++ b/tests/unit-tests/bench.t.cpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2017-2022, Regents of the University of California.
+ * Copyright (c) 2017-2023, Regents of the University of California.
  *
  * This file is part of ndncert, a certificate management system based on NDN.
  *
@@ -40,7 +40,7 @@
   auto key = identity.getDefaultKey();
   auto cert = key.getDefaultCertificate();
 
-  ndn::util::DummyClientFace face(m_io, m_keyChain, {true, true});
+  ndn::DummyClientFace face(m_io, m_keyChain, {true, true});
   ca::CaModule ca(face, m_keyChain, "tests/unit-tests/config-files/config-ca-1", "ca-storage-memory");
   advanceClocks(time::milliseconds(20), 60);
   auto profileData = ca.getCaProfileData();
@@ -98,7 +98,7 @@
   auto key = identity.getDefaultKey();
   auto cert = key.getDefaultCertificate();
 
-  ndn::util::DummyClientFace face(m_io, m_keyChain, {true, true});
+  ndn::DummyClientFace face(m_io, m_keyChain, {true, true});
   ca::CaModule ca(face, m_keyChain, "tests/unit-tests/config-files/config-ca-1", "ca-storage-memory");
   advanceClocks(time::milliseconds(20), 60);