The following actions uses node12 which is deprecated and will be forced to run on node16: actions/setup-dotnet@v1. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

Using directive should appear within a namespace declaration (https://github.com/DotNetAnalyzers/StyleCopAnalyzers/blob/master/documentation/SA1200.md)