Bump SixLabors.ImageSharp from 2.1.2 to 2.1.3

Bumps [SixLabors.ImageSharp](https://github.com/SixLabors/ImageSharp) from 2.1.2 to 2.1.3.
- [Release notes](https://github.com/SixLabors/ImageSharp/releases)
- [Commits](SixLabors/ImageSharp@v2.1.2...v2.1.3)

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

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

BadMedicine.Dicom/BadMedicine.Dicom.csproj

@@ -41,7 +41,7 @@
 
   <ItemGroup>
     <PackageReference Include="HIC.BadMedicine" Version="1.0.1" />
-    <PackageReference Include="SixLabors.ImageSharp" Version="2.1.2" />
+    <PackageReference Include="SixLabors.ImageSharp" Version="2.1.3" />
     <PackageReference Include="SixLabors.ImageSharp.Drawing" Version="1.0.0-beta14" />
   </ItemGroup>