Update MSTest.TestFramework to 3.9.0 (#46306)

---
updated-dependencies:
- dependency-name: MSTest.TestFramework
  dependency-version: 3.9.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

docs/core/whats-new/snippets/dotnet-8/csharp/ConsoleApp/Project.csproj

@@ -12,7 +12,7 @@
     <PackageReference Include="Microsoft.Extensions.Diagnostics.Testing" Version="9.5.0" />
     <PackageReference Include="Microsoft.Extensions.Hosting" Version="9.0.5" />
     <PackageReference Include="Microsoft.Extensions.Hosting.Abstractions" Version="9.0.5" />
-    <PackageReference Include="MSTest.TestFramework" Version="3.8.3" />
+    <PackageReference Include="MSTest.TestFramework" Version="3.9.0" />
   </ItemGroup>
 
 </Project>