Bump SixLabors.ImageSharp from 2.1.10 to 2.1.11#3

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dependabot/nuget/doc/demo/DicomRenderImageTest2/DicomRenderImageTest/SixLabors.ImageSharp-2.1.11zhaotianff/ImageViewer:dependabot/nuget/doc/demo/DicomRenderImageTest2/DicomRenderImageTest/SixLabors.ImageSharp-2.1.11Copy head branch name to clipboard