Bump the dotnet group with 1 update

Bumps Microsoft.NET.Test.Sdk from 18.5.1 to 18.6.0

---
updated-dependencies:
- dependency-name: Microsoft.NET.Test.Sdk
  dependency-version: 18.6.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: dotnet
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

docs/ai/evaluation/snippets/evaluate-safety/EvaluateResponseSafety.csproj

@@ -18,7 +18,7 @@
     <PackageReference Include="Microsoft.Extensions.AI.OpenAI" Version="10.6.0" />
     <PackageReference Include="Microsoft.Extensions.Configuration" Version="10.0.8" />
     <PackageReference Include="Microsoft.Extensions.Configuration.UserSecrets" Version="10.0.8" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.5.1" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.6.0" />
     <PackageReference Include="MSTest" Version="4.2.3" />
   </ItemGroup>