Bump Microsoft.SemanticKernel (#42647)

Bumps the dotnet group in /docs/ai/tutorials/snippets/llm-eval with 1 update: [Microsoft.SemanticKernel](https://github.com/microsoft/semantic-kernel).


Updates `Microsoft.SemanticKernel` from 1.19.0 to 1.20.0
- [Release notes](https://github.com/microsoft/semantic-kernel/releases)
- [Commits](microsoft/semantic-kernel@dotnet-1.19.0...dotnet-1.20.0)

---
updated-dependencies:
- dependency-name: Microsoft.SemanticKernel
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: dotnet
...

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

docs/ai/tutorials/snippets/llm-eval/llm-eval.csproj

@@ -12,7 +12,7 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.Extensions.Configuration" Version="8.0.0" />
     <PackageReference Include="Microsoft.Extensions.Configuration.UserSecrets" Version="8.0.0" />
-    <PackageReference Include="Microsoft.SemanticKernel" Version="1.19.0" />
+    <PackageReference Include="Microsoft.SemanticKernel" Version="1.20.0" />
   </ItemGroup>
 
 </Project>