nuget-dressca: bump Microsoft.NET.Test.Sdk (#559)

Bumps [Microsoft.NET.Test.Sdk](https://github.com/microsoft/vstest) from 17.7.0 to 17.8.0.
- [Release notes](https://github.com/microsoft/vstest/releases)
- [Changelog](https://github.com/microsoft/vstest/blob/main/docs/releases.md)
- [Commits](microsoft/vstest@v17.7.0...v17.8.0)

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

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

samples/Dressca/dressca-backend/Directory.Packages.props

@@ -9,7 +9,7 @@
     <PackageVersion Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="6.0.0" />
     <PackageVersion Include="Microsoft.Extensions.Logging" Version="6.0.0" />
     <PackageVersion Include="Microsoft.Extensions.Logging.Abstractions" Version="6.0.4" />
-    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.7.0" />
+    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
     <PackageVersion Include="Moq" Version="4.20.69" />
     <PackageVersion Include="NSwag.AspNetCore" Version="13.19.0" />
     <PackageVersion Include="NSwag.MSBuild" Version="13.19.0" />