Avoid using deprecated ndn-cxx type aliases

Change-Id: I55fd500377698adc8035113bdff2d64091a36e07
diff --git a/src/lsa/adj-lsa.cpp b/src/lsa/adj-lsa.cpp
index e6d2f6e..38edb63 100644
--- a/src/lsa/adj-lsa.cpp
+++ b/src/lsa/adj-lsa.cpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2014-2022,  The University of Memphis,
+ * Copyright (c) 2014-2023,  The University of Memphis,
  *                           Regents of the University of California,
  *                           Arizona Board of Regents.
  *
@@ -25,7 +25,7 @@
 namespace nlsr {
 
 AdjLsa::AdjLsa(const ndn::Name& originRouter, uint64_t seqNo,
-               const ndn::time::system_clock::TimePoint& timepoint,
+               const ndn::time::system_clock::time_point& timepoint,
                uint32_t noLink, AdjacencyList& adl)
   : Lsa(originRouter, seqNo, timepoint)
   , m_noLink(noLink)