chore(deps): bump SixLabors.ImageSharp from 3.1.2 to 3.1.3 in /src

[dependabot[bot]]

Bumps SixLabors.ImageSharp from 3.1.2 to 3.1.3.

Release notes

Sourced from SixLabors.ImageSharp's releases.

v3.1.3

What's Changed

• Make DrawImage processor more robust to bad input. by @​JimBobSquarePants in SixLabors/ImageSharp#2673
• Don't skip reading data for animation chunks on identify. by @​JimBobSquarePants in SixLabors/ImageSharp#2674
• Fix AccessViolationException and hard crash with animated webp by @​JimBobSquarePants in SixLabors/ImageSharp#2676
• Use a smarter approach to determine the transparent index when encoding palette Pngs. by @​JimBobSquarePants in SixLabors/ImageSharp#2677
• Limit ancillary PNG chunk size. by @​JimBobSquarePants in SixLabors/ImageSharp#2681

Full Changelog: https://github.com/SixLabors/ImageSharp/compare/v3.1.2...v3.1.3

Commits

• 3f22857 Allow nightlies from previous releases
• 0942689 Merge pull request #2681 from SixLabors/js/png-dimensions-fix
• edc87ad Limit ancillary chunk size.
• 3806fd2 Merge pull request #2677 from SixLabors/js/fix-2268
• 0cbf475 Merge pull request #2676 from SixLabors/js/fix-2670
• 624277b Update Issue2668_Quantized_Encode_Alpha_Rgba32_Issue_2668.png
• f6d24ed Update src/ImageSharp/Formats/Webp/AlphaDecoder.cs
• ed2cd31 Fix casing
• 2a54881 Use a smarter approach to determine the transparent index
• 223f647 Update AlphaDecoder.cs
• Additional commits viewable in compare view

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