Bump SixLabors.ImageSharp from 3.1.11 to 3.1.12#319

SimonCropp merged 1 commit intomainVerifyTests/Verify.ImageSharp.Compare:mainfrom

dependabot/nuget/src/SixLabors.ImageSharp-3.1.12VerifyTests/Verify.ImageSharp.Compare:dependabot/nuget/src/SixLabors.ImageSharp-3.1.12Copy head branch name to clipboard