Migrate to .NET 9 (#198)

src/Ryujinx.UI.Common/App/ApplicationData.cs

@@ -164,7 +164,7 @@ namespace Ryujinx.UI.App.Common
             NsoReader reader = new();
             reader.Initialize(nsoFile.Release().AsStorage().AsFile(OpenMode.Read)).ThrowIfFailure();
 
-            return BitConverter.ToString(reader.Header.ModuleId.ItemsRo.ToArray()).Replace("-", string.Empty).ToUpper()[..16];
+            return Convert.ToHexString(reader.Header.ModuleId.ItemsRo.ToArray()).Replace("-", string.Empty).ToUpper()[..16];
         }
     }
 }

src/Ryujinx.UI.Common/Ryujinx.UI.Common.csproj

@@ -1,7 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net8.0</TargetFramework>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <DefaultItemExcludes>$(DefaultItemExcludes);._*</DefaultItemExcludes>
   </PropertyGroup>