Bump Microsoft.NET.Test.Sdk and Microsoft.TestPlatform.ObjectModel

Bumps [Microsoft.NET.Test.Sdk](https://github.com/microsoft/vstest) and [Microsoft.TestPlatform.ObjectModel](https://github.com/microsoft/vstest). These dependencies needed to be updated together.

Updates `Microsoft.NET.Test.Sdk` from 17.8.0 to 17.9.0
- [Release notes](https://github.com/microsoft/vstest/releases)
- [Changelog](https://github.com/microsoft/vstest/blob/main/docs/releases.md)
- [Commits](microsoft/vstest@v17.8.0...v17.9.0)

Updates `Microsoft.TestPlatform.ObjectModel` from 17.8.0 to 17.9.0
- [Release notes](https://github.com/microsoft/vstest/releases)
- [Changelog](https://github.com/microsoft/vstest/blob/main/docs/releases.md)
- [Commits](microsoft/vstest@v17.8.0...v17.9.0)

---
updated-dependencies:
- dependency-name: Microsoft.NET.Test.Sdk
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: Microsoft.TestPlatform.ObjectModel
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

src/NGherkin.Tests/NGherkin.Tests.csproj

@@ -7,7 +7,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.9.0" />
   </ItemGroup>
 
   <ItemGroup>