Update dependencies from https://github.com/mono/linker build 20210218.4 (#48493)

[master] Update dependencies from mono/linker

Author: dotnet-maestro[bot]

eng/Version.Details.xml

@@ -194,9 +194,9 @@
       <Uri>https://github.com/dotnet/runtime</Uri>
       <Sha>2437619a41b22e9326700403c845dde69d2a0f78</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.NET.ILLink.Tasks" Version="6.0.0-alpha.1.21116.1">
+    <Dependency Name="Microsoft.NET.ILLink.Tasks" Version="6.0.100-preview.2.21118.4">
       <Uri>https://github.com/mono/linker</Uri>
-      <Sha>2cb420dbabb4ec86d41a1b431696e58f45f031cd</Sha>
+      <Sha>c56d010e0d8ab845cce10b741e8981487d58e8e4</Sha>
     </Dependency>
     <Dependency Name="Microsoft.DotNet.XHarness.TestRunners.Xunit" Version="1.0.0-prerelease.21116.1">
       <Uri>https://github.com/dotnet/xharness</Uri>

eng/Versions.props

@@ -155,7 +155,7 @@
     <!-- Docs -->
     <MicrosoftPrivateIntellisenseVersion>5.0.0-preview-20201009.2</MicrosoftPrivateIntellisenseVersion>
     <!-- ILLink -->
-    <MicrosoftNETILLinkTasksVersion>6.0.0-alpha.1.21116.1</MicrosoftNETILLinkTasksVersion>
+    <MicrosoftNETILLinkTasksVersion>6.0.100-preview.2.21118.4</MicrosoftNETILLinkTasksVersion>
     <!-- ICU -->
     <MicrosoftNETCoreRuntimeICUTransportVersion>6.0.0-preview.2.21115.1</MicrosoftNETCoreRuntimeICUTransportVersion>
     <!-- Mono LLVM -->