refactor: migrate OPC UA server SDK 2.0 compilation and boundaries

src/Server/ZB.MOM.WW.OtOpcUa.OpcUaServer/AdvertisedAggregateFunctions.cs

@@ -27,6 +27,7 @@ namespace ZB.MOM.WW.OtOpcUa.OpcUaServer;
 /// </remarks>
 internal static class AdvertisedAggregateFunctions
 {
+    private static readonly object SyncGate = new();
     /// <summary>Every standard aggregate-function NodeId the SDK's nodeset knows (<c>ObjectIds.AggregateFunction_*</c>).</summary>
     private static readonly NodeId[] StandardAggregateIds = typeof(ObjectIds)
         .GetFields(BindingFlags.Public | BindingFlags.Static)
@@ -56,10 +57,10 @@ internal static class AdvertisedAggregateFunctions
     /// <returns>The advertised NodeIds, or <c>null</c> when the diagnostics node manager or folder is not available.</returns>
     public static IReadOnlyList<NodeId>? Apply(IServerInternal server, IReadOnlySet<HistoryAggregateType> served)
     {
-        if (server?.DiagnosticsNodeManager is not CustomNodeManager2 diagnostics) return null;
+        if (server?.DiagnosticsNodeManager is not DiagnosticsNodeManager diagnostics) return null;
 
         var advertised = new List<NodeId>();
-        lock (diagnostics.Lock)
+        lock (SyncGate)
         {
             var folder = diagnostics.FindPredefinedNode<BaseObjectState>(Folder);
             if (folder is null) return null;