Bump MSTest.TestFramework

Bumps the dotnet group in /docs/core/whats-new/snippets/dotnet-8/csharp/ConsoleApp with 1 update: [MSTest.TestFramework](https://github.com/microsoft/testfx).


Updates `MSTest.TestFramework` from 3.7.2 to 3.7.3
- [Release notes](https://github.com/microsoft/testfx/releases)
- [Changelog](https://github.com/microsoft/testfx/blob/main/docs/Changelog.md)
- [Commits](microsoft/testfx@v3.7.2...v3.7.3)

---
updated-dependencies:
- dependency-name: MSTest.TestFramework
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: dotnet
...

Signed-off-by: dependabot[bot] <[email protected]>

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="9.1.0" />
     <PackageReference Include="Microsoft.Extensions.Hosting" Version="9.0.1" />
     <PackageReference Include="Microsoft.Extensions.Hosting.Abstractions" Version="9.0.1" />
-    <PackageReference Include="MSTest.TestFramework" Version="3.7.2" />
+    <PackageReference Include="MSTest.TestFramework" Version="3.7.3" />
   </ItemGroup>
 
 </Project>