Bump SixLabors.ImageSharp from 1.0.2 to 2.1.8 in /Santolibre.Map.Elevation.Lib#2

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dependabot/nuget/Santolibre.Map.Elevation.Lib/SixLabors.ImageSharp-2.1.8andywcoder/map-elevation-core:dependabot/nuget/Santolibre.Map.Elevation.Lib/SixLabors.ImageSharp-2.1.8Copy head branch name to clipboard