Update IntegrationTestApp to net6.0.

samples/IntegrationTestApp/IntegrationTestApp.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <OutputType>WinExe</OutputType>
-    <TargetFramework>netcoreapp3.1</TargetFramework>
+    <TargetFramework>net6.0</TargetFramework>
     <Nullable>enable</Nullable>
   </PropertyGroup>
   <Import Project="..\..\build\BuildTargets.targets" />

tests/Avalonia.IntegrationTests.Win32/TestAppFixture.cs

@@ -10,7 +10,7 @@ namespace Avalonia.IntegrationTests.Win32
     public class TestAppFixture : IDisposable
     {
         private const string WindowsApplicationDriverUrl = "http://127.0.0.1:4723";
-        private const string TestAppPath = @"..\..\..\..\..\samples\IntegrationTestApp\bin\Debug\netcoreapp3.1\IntegrationTestApp.exe";
+        private const string TestAppPath = @"..\..\..\..\..\samples\IntegrationTestApp\bin\Debug\net6.0\IntegrationTestApp.exe";
 
         public TestAppFixture()
         {