Bump SixLabors.ImageSharp from 2.0.0 to 3.1.3 in /PokemonGameEngine#81

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dependabot/nuget/PokemonGameEngine/SixLabors.ImageSharp-3.1.3Kermalis/PokemonGameEngine:dependabot/nuget/PokemonGameEngine/SixLabors.ImageSharp-3.1.3Copy head branch name to clipboard