Bump SixLabors.ImageSharp from 1.0.4 to 3.0.1

Bumps [SixLabors.ImageSharp](https://github.com/SixLabors/ImageSharp) from 1.0.4 to 3.0.1.
- [Release notes](https://github.com/SixLabors/ImageSharp/releases)
- [Commits](SixLabors/ImageSharp@v1.0.4...v3.0.1)

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

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

SkyEditor.UI/SkyEditor.UI.csproj

@@ -48,7 +48,7 @@
     <PackageReference Include="GtkSourceSharp" Version="3.24.24.*" />
     <PackageReference Include="LibHac" Version="0.16.0" />
     <PackageReference Include="Microsoft.Win32.Registry" Version="5.0.0" />
-    <PackageReference Include="SixLabors.ImageSharp" Version="1.0.4" />
+    <PackageReference Include="SixLabors.ImageSharp" Version="3.0.1" />
     <PackageReference Include="SkyEditor.IO" Version="5.1.17" />
   </ItemGroup>