Update dependencies from https://github.com/mono/linker build 20210819.1 (#57777)

Microsoft.NET.ILLink.Tasks
 From Version 6.0.100-preview.6.21416.1 -> To Version 6.0.100-preview.6.21419.1

Co-authored-by: dotnet-maestro[bot] <dotnet-maestro[bot]@users.noreply.github.com>

Author: dotnet-maestro[bot]

eng/Version.Details.xml

@@ -190,9 +190,9 @@
       <Uri>https://github.com/dotnet/runtime</Uri>
       <Sha>fde6b37e985605d862c070256de7c97e2a3f3342</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.NET.ILLink.Tasks" Version="6.0.100-preview.6.21416.1">
+    <Dependency Name="Microsoft.NET.ILLink.Tasks" Version="6.0.100-preview.6.21419.1">
       <Uri>https://github.com/mono/linker</Uri>
-      <Sha>5b2391c2c56af47350a5789375e8dbddc692e67f</Sha>
+      <Sha>5851f6d62fedd9eb2edea9712c9764ca2ad6ab60</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

@@ -167,7 +167,7 @@
     <!-- Docs -->
     <MicrosoftPrivateIntellisenseVersion>5.0.0-preview-20201009.2</MicrosoftPrivateIntellisenseVersion>
     <!-- ILLink -->
-    <MicrosoftNETILLinkTasksVersion>6.0.100-preview.6.21416.1</MicrosoftNETILLinkTasksVersion>
+    <MicrosoftNETILLinkTasksVersion>6.0.100-preview.6.21419.1</MicrosoftNETILLinkTasksVersion>
     <MicrosoftNETILLinkAnalyzerPackageVersion>$(MicrosoftNETILLinkTasksVersion)</MicrosoftNETILLinkAnalyzerPackageVersion>
     <!-- ICU -->
     <MicrosoftNETCoreRuntimeICUTransportVersion>6.0.0-rc.1.21416.1</MicrosoftNETCoreRuntimeICUTransportVersion>