chore: Update tests dependencies (#3978)

* chore: Update tests dependencies

* Apply TSR Berry suggestion to add a GC.SuppressFinalize in MemoryBlock.cs

* Ensure we wait for the test thread to be dead on PartialUnmap

* Use platform attribute for os specific tests

* Make P/Invoke methods private

* Downgrade NUnit3TestAdapter to 4.1.0

* test: Disable warning about platform compat for ThreadLocalMap()

Co-authored-by: TSR Berry <20988865+TSRBerry@users.noreply.github.com>

Ryujinx.Memory/MemoryBlock.cs

@@ -379,7 +379,12 @@ namespace Ryujinx.Memory
         /// <remarks>
         /// It's an error to use the memory block after disposal.
         /// </remarks>
-        public void Dispose() => FreeMemory();
+        public void Dispose()
+        {
+            FreeMemory();
+
+            GC.SuppressFinalize(this);
+        }
 
         ~MemoryBlock() => FreeMemory();