update Microsoft.DotNet.RemoteExecutor & XUnitExtensions

tests/Directory.Build.targets

@@ -22,8 +22,8 @@
     <PackageReference Update="BenchmarkDotNet.Diagnostics.Windows" Version="0.12.1" Condition="'$(IsWindows)'=='true'" />
     <PackageReference Update="Colourful" Version="2.0.5" />
     <PackageReference Update="Magick.NET-Q16-AnyCPU" Version="7.23.2.1" />
-    <PackageReference Update="Microsoft.DotNet.RemoteExecutor" Version="6.0.0-beta.20513.1" />
-    <PackageReference Update="Microsoft.DotNet.XUnitExtensions" Version="6.0.0-beta.20513.1" />
+    <PackageReference Update="Microsoft.DotNet.RemoteExecutor" Version="6.0.0-beta.21311.3" />
+    <PackageReference Update="Microsoft.DotNet.XUnitExtensions" Version="6.0.0-beta.21311.3" />
     <PackageReference Update="Moq" Version="4.14.6" />
     <PackageReference Update="Pfim" Version="0.9.1" />
     <PackageReference Include="runtime.osx.10.10-x64.CoreCompat.System.Drawing" Version="5.8.64" Condition="'$(IsOSX)'=='true'" />