fix: Extension package reference UTP so that NetworkEndPoint is referenced. (#162)

com.community.netcode.extensions/Runtime/com.community.contrib.extensions.asmdef

@@ -4,7 +4,8 @@
     "references": [
         "Unity.Collections",
         "Unity.Netcode.Runtime",
-        "Unity.Netcode.Adapter.UTP"
+        "Unity.Netcode.Adapter.UTP",
+        "Unity.Networking.Transport"
     ],
     "includePlatforms": [],
     "excludePlatforms": [],