Bump MSTest (#45412)

Bumps the dotnet group in /docs/ai/quickstarts/snippets/evaluate-ai-responses with 1 update: [MSTest](https://github.com/microsoft/testfx).


Updates `MSTest` from 3.8.2 to 3.8.3
- [Release notes](https://github.com/microsoft/testfx/releases)
- [Changelog](https://github.com/microsoft/testfx/blob/main/docs/Changelog.md)
- [Commits](microsoft/testfx@v3.8.2...v3.8.3)

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

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

Author: dependabot[bot]

docs/ai/quickstarts/snippets/evaluate-ai-responses/TestAI.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
     <TargetFramework>net9.0</TargetFramework>
@@ -18,7 +18,7 @@
     <PackageReference Include="Microsoft.Extensions.Configuration" Version="9.0.3" />
     <PackageReference Include="Microsoft.Extensions.Configuration.UserSecrets" Version="9.0.3" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.14.0-preview-25107-01" />
-    <PackageReference Include="MSTest" Version="3.8.2" />
+    <PackageReference Include="MSTest" Version="3.8.3" />
   </ItemGroup>
 
   <ItemGroup>