Update dependency SixLabors.ImageSharp to v2.1.6 (v10/contrib)

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This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
SixLabors.ImageSharp	2.1.3 -> 2.1.6

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Release Notes

SixLabors/ImageSharp (SixLabors.ImageSharp)

### [`v2.1.6`](https://togithub.com/SixLabors/ImageSharp/releases/tag/v2.1.6) #### What's Changed - Backport - Handle EOF in Jpeg bit reader when data is bad to prevent DOS attack. by [@​JimBobSquarePants](https://togithub.com/JimBobSquarePants) in [https://github.com/SixLabors/ImageSharp/pull/2524](https://togithub.com/SixLabors/ImageSharp/pull/2524) **Full Changelog**: https://github.com/SixLabors/ImageSharp/compare/v2.1.5...v2.1.6 ### [`v2.1.5`](https://togithub.com/SixLabors/ImageSharp/releases/tag/v2.1.5) #### What's Changed - Backport [#​2501](https://togithub.com/SixLabors/ImageSharp/issues/2501) by [@​JimBobSquarePants](https://togithub.com/JimBobSquarePants) in [https://github.com/SixLabors/ImageSharp/pull/2509](https://togithub.com/SixLabors/ImageSharp/pull/2509) **Full Changelog**: https://github.com/SixLabors/ImageSharp/compare/v2.1.4...v2.1.5 ### [`v2.1.4`](https://togithub.com/SixLabors/ImageSharp/releases/tag/v2.1.4) #### What's Changed - Backport WebP fix to 2.1 by [@​antonfirsov](https://togithub.com/antonfirsov) in [https://github.com/SixLabors/ImageSharp/pull/2420](https://togithub.com/SixLabors/ImageSharp/pull/2420) **Full Changelog**: https://github.com/SixLabors/ImageSharp/compare/v2.1.3...v2.1.4

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