Update dependencies from https://github.com/dotnet/xharness build 202…

…00506.2 (#35963)

- Microsoft.DotNet.XHarness.Tests.Runners: 1.0.0-prerelease.20255.4 -> 1.0.0-prerelease.20256.2

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

eng/Version.Details.xml

@@ -174,9 +174,9 @@
       <Uri>https://github.com/mono/linker</Uri>
       <Sha>fe2d8f8c2007ecf3789df3d8169d9809111875bb</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.DotNet.XHarness.Tests.Runners" Version="1.0.0-prerelease.20255.4">
+    <Dependency Name="Microsoft.DotNet.XHarness.Tests.Runners" Version="1.0.0-prerelease.20256.2">
       <Uri>https://github.com/dotnet/xharness</Uri>
-      <Sha>669f7ff3cdcf7770e566c0bff795d38cd59ba961</Sha>
+      <Sha>1bf48d38e217b0edebbd42c2af3e47fb01211c37</Sha>
     </Dependency>
   </ToolsetDependencies>
 </Dependencies>

eng/Versions.props

@@ -113,7 +113,7 @@
     <SystemDataSqlClientVersion>4.8.0</SystemDataSqlClientVersion>
     <!-- Testing -->
     <MicrosoftNETTestSdkVersion>16.7.0-preview-20200429-01</MicrosoftNETTestSdkVersion>
-    <MicrosoftDotNetXHarnessTestsRunnersVersion>1.0.0-prerelease.20255.4</MicrosoftDotNetXHarnessTestsRunnersVersion>
+    <MicrosoftDotNetXHarnessTestsRunnersVersion>1.0.0-prerelease.20256.2</MicrosoftDotNetXHarnessTestsRunnersVersion>
     <XUnitVersion>2.4.1</XUnitVersion>
     <CoverletCollectorVersion>1.2.1</CoverletCollectorVersion>
     <TraceEventVersion>2.0.5</TraceEventVersion>