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

dependabot[bot] wants to merge 1 commit intomasterJorgemagic/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