nuget: Bump Microsoft.NET.Test.Sdk from 18.7.0 to 18.8.1#21

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dependabot/nuget/tests/UnturnedRedistUpdateTool.Tests/Microsoft.NET.Test.Sdk-18.8.1RocketModFix/UnturnedRedistUpdateTool:dependabot/nuget/tests/UnturnedRedistUpdateTool.Tests/Microsoft.NET.Test.Sdk-18.8.1Copy head branch name to clipboard