Bump SixLabors.ImageSharp from 2.1.3 to 2.1.11

---
updated-dependencies:
- dependency-name: SixLabors.ImageSharp
  dependency-version: 2.1.11
  dependency-type: direct:production
...

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

Author: dependabot[bot]

src/SSCMS/SSCMS.csproj

@@ -38,6 +38,7 @@
 
   <ItemGroup>
     <!-- <PackageReference Include="Datory" Version="7.3.1" /> -->
+    <PackageReference Include="SixLabors.ImageSharp" Version="2.1.11" />
     <ProjectReference Include="..\Datory\Datory.csproj" />
   </ItemGroup>