Bump SixLabors.ImageSharp from 1.0.0-beta0007 to 2.1.8 in /18-Reflection#7

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masterJorgemagic/CSharpDirectXRaytracing:masterfrom

dependabot/nuget/18-Reflection/SixLabors.ImageSharp-2.1.8Jorgemagic/CSharpDirectXRaytracing:dependabot/nuget/18-Reflection/SixLabors.ImageSharp-2.1.8Copy head branch name to clipboard