Bump SixLabors.ImageSharp from 3.1.1 to 3.1.3 in /src/ImageSharp.Drawing

Bumps [SixLabors.ImageSharp](https://github.com/SixLabors/ImageSharp) from 3.1.1 to 3.1.3.
- [Release notes](https://github.com/SixLabors/ImageSharp/releases)
- [Commits](SixLabors/ImageSharp@v3.1.1...v3.1.3)

---
updated-dependencies:
- dependency-name: SixLabors.ImageSharp
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

src/ImageSharp.Drawing/ImageSharp.Drawing.csproj

@@ -46,7 +46,7 @@
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="SixLabors.Fonts" Version="2.0.1" />
-    <PackageReference Include="SixLabors.ImageSharp" Version="3.1.1" />
+    <PackageReference Include="SixLabors.ImageSharp" Version="3.1.3" />
   </ItemGroup>
   <Import Project="..\..\shared-infrastructure\src\SharedInfrastructure\SharedInfrastructure.projitems" Label="Shared" />
 </Project>