Update dependencies from SixLabors to the latest version before the license change (#6440)

* nuget: bump SixLabors.ImageSharp from 1.0.4 to 2.1.3 (#3976)

* nuget: bump SixLabors.ImageSharp from 1.0.4 to 2.1.3

Bumps [SixLabors.ImageSharp](https://github.com/SixLabors/ImageSharp) from 1.0.4 to 2.1.3.
- [Release notes](https://github.com/SixLabors/ImageSharp/releases)
- [Commits](https://github.com/SixLabors/ImageSharp/compare/v1.0.4...v2.1.3)

---
updated-dependencies:
- dependency-name: SixLabors.ImageSharp
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

* Update for 2.x changes

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Mary <mary@mary.zone>

* Update SixLabors.ImageSharp to 2.1.7

This is the latest version we can update to without the license change.

* Update SixLabors.ImageSharp.Drawing to v1.0.0

This is the latest version we can update to without the license change.

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Mary <mary@mary.zone>

src/Ryujinx/UI/Windows/IconColorPicker.cs

@@ -127,7 +127,7 @@ namespace Ryujinx.Ava.UI.Windows
 
         public static Bgra32[] GetBuffer(Image<Bgra32> image)
         {
-            return image.TryGetSinglePixelSpan(out var data) ? data.ToArray() : Array.Empty<Bgra32>();
+            return image.DangerousTryGetSinglePixelMemory(out var data) ? data.ToArray() : Array.Empty<Bgra32>();
         }
 
         private static int GetColorScore(Dictionary<int, int> dominantColorBin, int maxHitCount, PaletteColor color)