[main] Update dependencies from microsoft/testfx (#50426)

Author: SimonZhao888

eng/Version.Details.props

@@ -141,8 +141,8 @@ This file should be imported by eng/Versions.props
     <!-- dotnet/core-setup dependencies -->
     <NETStandardLibraryRefPackageVersion>2.1.0</NETStandardLibraryRefPackageVersion>
     <!-- microsoft/testfx dependencies -->
-    <MicrosoftTestingPlatformPackageVersion>1.9.0-preview.25415.14</MicrosoftTestingPlatformPackageVersion>
-    <MSTestPackageVersion>3.11.0-preview.25415.14</MSTestPackageVersion>
+    <MicrosoftTestingPlatformPackageVersion>1.9.0-preview.25421.4</MicrosoftTestingPlatformPackageVersion>
+    <MSTestPackageVersion>3.11.0-preview.25421.4</MSTestPackageVersion>
   </PropertyGroup>
   <!--Property group for alternate package version names-->
   <PropertyGroup>

eng/Version.Details.xml

@@ -553,13 +553,13 @@
       <Uri>https://github.com/dotnet/dotnet</Uri>
       <Sha>7f2a07b481a3d24677ebcf6a45e7e27c8ff95a4e</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.Testing.Platform" Version="1.9.0-preview.25415.14">
+    <Dependency Name="Microsoft.Testing.Platform" Version="1.9.0-preview.25421.4">
       <Uri>https://github.com/microsoft/testfx</Uri>
-      <Sha>4fff5964ffc55cda6384546c29a1c44fb0b37a8a</Sha>
+      <Sha>b6e4331e0c11a01178d4a832cb0eb6beeebe945a</Sha>
     </Dependency>
-    <Dependency Name="MSTest" Version="3.11.0-preview.25415.14">
+    <Dependency Name="MSTest" Version="3.11.0-preview.25421.4">
       <Uri>https://github.com/microsoft/testfx</Uri>
-      <Sha>4fff5964ffc55cda6384546c29a1c44fb0b37a8a</Sha>
+      <Sha>b6e4331e0c11a01178d4a832cb0eb6beeebe945a</Sha>
     </Dependency>
     <Dependency Name="Microsoft.Extensions.Configuration.Ini" Version="10.0.0-rc.2.25416.109">
       <Uri>https://github.com/dotnet/dotnet</Uri>