Bump SixLabors.ImageSharp from 1.0.2 to 2.1.9 in /Spectre.Console/Spectre.Console.ImageSharp#323

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dependabot/nuget/Spectre.Console/Spectre.Console.ImageSharp/SixLabors.ImageSharp-2.1.9NextGenSoftwareUK/OASIS:dependabot/nuget/Spectre.Console/Spectre.Console.ImageSharp/SixLabors.ImageSharp-2.1.9Copy head branch name to clipboard