Bump SixLabors.ImageSharp from 3.1.12 to 4.0.0#6

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dependabot/nuget/Add-Identity-To-Content/SixLabors.ImageSharp-4.0.0MrValentine7777/Add-Identity-To-Content:dependabot/nuget/Add-Identity-To-Content/SixLabors.ImageSharp-4.0.0Copy head branch name to clipboard