Update dependencies from https://github.com/mono/linker build 20210823.4 (#58010)

Microsoft.NET.ILLink.Tasks
 From Version 6.0.100-preview.6.21423.1 -> To Version 6.0.100-preview.6.21423.4
Co-authored-by: Ndotnet-maestro[bot] <dotnet-maestro[bot]@users.noreply.github.com>

eng/Version.Details.xml

@@ -190,9 +190,9 @@
       <Uri>https://github.com/dotnet/runtime</Uri>
       <Sha>3d5d26181cd7bc07ea6c6f87710c14ccd043b415</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.NET.ILLink.Tasks" Version="6.0.100-preview.6.21423.1">
+    <Dependency Name="Microsoft.NET.ILLink.Tasks" Version="6.0.100-preview.6.21423.4">
       <Uri>https://github.com/mono/linker</Uri>
-      <Sha>062c230b2674ea187da17d94742531e196e1e172</Sha>
+      <Sha>f48949f13430ad17bef203d7f9d0bad19c399a8e</Sha>
     </Dependency>
     <Dependency Name="Microsoft.DotNet.XHarness.TestRunners.Xunit" Version="1.0.0-prerelease.21404.1">
       <Uri>https://github.com/dotnet/xharness</Uri>

eng/Versions.props

@@ -168,7 +168,7 @@
     <!-- Docs -->
     <MicrosoftPrivateIntellisenseVersion>5.0.0-preview-20201009.2</MicrosoftPrivateIntellisenseVersion>
     <!-- ILLink -->
-    <MicrosoftNETILLinkTasksVersion>6.0.100-preview.6.21423.1</MicrosoftNETILLinkTasksVersion>
+    <MicrosoftNETILLinkTasksVersion>6.0.100-preview.6.21423.4</MicrosoftNETILLinkTasksVersion>
     <MicrosoftNETILLinkAnalyzerPackageVersion>$(MicrosoftNETILLinkTasksVersion)</MicrosoftNETILLinkAnalyzerPackageVersion>
     <!-- ICU -->
     <MicrosoftNETCoreRuntimeICUTransportVersion>6.0.0-rc.1.21416.1</MicrosoftNETCoreRuntimeICUTransportVersion>