going on big buffer, need three diff task scheduler

StgSharp.Mathematics/Numeric/MatrixParallel.cs

@@ -43,7 +43,14 @@ namespace StgSharp.Mathematics.Numeric
         private static CapacityFixedStack<MatrixParallelThread> _threads;
 
         private static volatile int RemainThreadCount = 0;
-        private static readonly object _lock = new();
+        private static readonly
+#if NET10_0_OR_GREATER
+            Lock
+#else
+            object
+#endif
+            _lock = new();
+
         private static ThreadPriority _AfterWork = ThreadPriority.Lowest;
 
         public static bool SupportParallel { get; } = Environment.ProcessorCount > 6;