Migrate to .NET 9 (#198)

src/Ryujinx.Audio/Renderer/Server/AudioRenderSystem.cs

@@ -26,7 +26,7 @@ namespace Ryujinx.Audio.Renderer.Server
 {
     public class AudioRenderSystem : IDisposable
     {
-        private readonly object _lock = new();
+        private readonly Lock _lock = new();
 
         private AudioRendererRenderingDevice _renderingDevice;
         private AudioRendererExecutionMode _executionMode;

src/Ryujinx.Audio/Renderer/Server/AudioRendererManager.cs

@@ -19,12 +19,12 @@ namespace Ryujinx.Audio.Renderer.Server
         /// <summary>
         /// Lock used for session allocation.
         /// </summary>
-        private readonly object _sessionLock = new();
+        private readonly Lock _sessionLock = new();
 
         /// <summary>
         /// Lock used to control the <see cref="AudioProcessor"/> running state.
         /// </summary>
-        private readonly object _audioProcessorLock = new();
+        private readonly Lock _audioProcessorLock = new();
 
         /// <summary>
         /// The session ids allocation table.

src/Ryujinx.Audio/Renderer/Server/Upsampler/UpsamplerManager.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Diagnostics;
+using System.Threading;
 
 namespace Ryujinx.Audio.Renderer.Server.Upsampler
 {
@@ -16,7 +17,7 @@ namespace Ryujinx.Audio.Renderer.Server.Upsampler
         /// <summary>
         /// Global lock of the object.
         /// </summary>
-        private readonly object _lock = new();
+        private readonly Lock _lock = new();
 
         /// <summary>
         /// The upsamplers instances.