Bump SixLabors.ImageSharp from 3.1.7 to 3.1.11

---
updated-dependencies:
- dependency-name: SixLabors.ImageSharp
  dependency-version: 3.1.11
  dependency-type: direct:production
...

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

Author: dependabot[bot]

ndd2.csproj

@@ -54,7 +54,7 @@
     <PackageReference Include="FFMediaToolkit" Version="4.5.1" />
     <PackageReference Include="FFmpeg.AutoGen" Version="7.0.0" />
     <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
-    <PackageReference Include="SixLabors.ImageSharp" Version="3.1.7" />
+    <PackageReference Include="SixLabors.ImageSharp" Version="3.1.11" />
   </ItemGroup>
 
   <ItemGroup>