Bump SixLabors.ImageSharp from 3.1.0 to 3.1.3 in /src/ImageSharp.Web

Bumps [SixLabors.ImageSharp](https://github.com/SixLabors/ImageSharp) from 3.1.0 to 3.1.3.
- [Release notes](https://github.com/SixLabors/ImageSharp/releases)
- [Commits](SixLabors/ImageSharp@v3.1.0...v3.1.3)

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

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

src/ImageSharp.Web/ImageSharp.Web.csproj

@@ -46,7 +46,7 @@
   <ItemGroup>
     <FrameworkReference Include="Microsoft.AspNetCore.App" />
     <PackageReference Include="Microsoft.IO.RecyclableMemoryStream" Version="2.3.2" />
-    <PackageReference Include="SixLabors.ImageSharp" Version="3.1.0" />
+    <PackageReference Include="SixLabors.ImageSharp" Version="3.1.3" />
   </ItemGroup>
 
   <Import Project="..\..\shared-infrastructure\src\SharedInfrastructure\SharedInfrastructure.projitems" Label="Shared" />