Bump SixLabors.ImageSharp from 1.0.0-beta0006 to 2.1.7 in /TheNextWeek#1

dependabot[bot] wants to merge 1 commit intomasterSCLDGit/ShirleyTracerSharp:masterfrom

dependabot/nuget/TheNextWeek/SixLabors.ImageSharp-2.1.7SCLDGit/ShirleyTracerSharp:dependabot/nuget/TheNextWeek/SixLabors.ImageSharp-2.1.7Copy head branch name to clipboard