Migrate to .NET 9

src/ARMeilleure/Translation/PTC/PtcProfiler.cs

@@ -41,7 +41,7 @@ namespace ARMeilleure.Translation.PTC
 
         private readonly ManualResetEvent _waitEvent;
 
-        private readonly object _lock;
+        private readonly Lock _lock = new();
 
         private bool _disposed;
 
@@ -65,8 +65,6 @@ namespace ARMeilleure.Translation.PTC
 
             _waitEvent = new ManualResetEvent(true);
 
-            _lock = new object();
-
             _disposed = false;
 
             ProfiledFuncs = new Dictionary<ulong, FuncProfile>();