[main] Update dependencies from microsoft/testfx (#6917)

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

Author: dotnet-maestro[bot]

eng/Version.Details.xml

@@ -17,13 +17,13 @@
       <Uri>https://dev.azure.com/devdiv/DevDiv/_git/vs-code-coverage</Uri>
       <Sha>b3ec110c7b23b6f726c516763f6810e74be7b192</Sha>
     </Dependency>
-    <Dependency Name="MSTest" Version="4.1.0-preview.25557.4">
+    <Dependency Name="MSTest" Version="4.1.0-preview.25558.6">
       <Uri>https://github.com/microsoft/testfx</Uri>
-      <Sha>0f7c5727aaaf3aa289f20ef65241847a405bbb6e</Sha>
+      <Sha>7df896aeec9505a44371dbe0dd2712764d0ce0f6</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.Testing.Platform" Version="2.1.0-preview.25557.4">
+    <Dependency Name="Microsoft.Testing.Platform" Version="2.1.0-preview.25558.6">
       <Uri>https://github.com/microsoft/testfx</Uri>
-      <Sha>0f7c5727aaaf3aa289f20ef65241847a405bbb6e</Sha>
+      <Sha>7df896aeec9505a44371dbe0dd2712764d0ce0f6</Sha>
     </Dependency>
   </ToolsetDependencies>
 </Dependencies>

eng/Versions.props

@@ -10,7 +10,7 @@
     <MicrosoftDotNetBuildTasksTemplatingPackageVersion>11.0.0-beta.25557.2</MicrosoftDotNetBuildTasksTemplatingPackageVersion>
     <MicrosoftTestingExtensionsCodeCoverageVersion>18.1.0-preview.25507.2</MicrosoftTestingExtensionsCodeCoverageVersion>
     <!-- empty line to avoid merge conflicts for darc PRs to update CC and MSTest+MTP -->
-    <MSTestVersion>4.1.0-preview.25557.4</MSTestVersion>
-    <MicrosoftTestingPlatformVersion>2.1.0-preview.25557.4</MicrosoftTestingPlatformVersion>
+    <MSTestVersion>4.1.0-preview.25558.6</MSTestVersion>
+    <MicrosoftTestingPlatformVersion>2.1.0-preview.25558.6</MicrosoftTestingPlatformVersion>
   </PropertyGroup>
 </Project>