Bump SixLabors.ImageSharp from 1.0.2 to 2.1.8 in /src/RadiantMapToObj#23

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dependabot/nuget/src/RadiantMapToObj/SixLabors.ImageSharp-2.1.8CptWesley/RadiantMapToWavefrontObj:dependabot/nuget/src/RadiantMapToObj/SixLabors.ImageSharp-2.1.8Copy head branch name to clipboard