chore(deps): update dependency microsoft.net.test.sdk to v17.9.0 (#750)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

src/Directory.Packages.props

@@ -16,7 +16,7 @@
     <PackageVersion Include="coverlet.msbuild" Version="6.0.0" />
     <PackageVersion Include="DiffEngine" Version="15.2.0" />
     <PackageVersion Include="FluentAssertions" Version="6.12.0" />
-    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
+    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.9.0" />
     <PackageVersion Include="Microsoft.Reactive.Testing" Version="$(RxVersion)" />
     <PackageVersion Include="Microsoft.SourceLink.GitHub" Version="8.0.0" />
     <PackageVersion Include="Nerdbank.GitVersioning" Version="3.6.133" />