Bump SixLabors.ImageSharp in /samples/ComputeSharp.Benchmark

Bumps [SixLabors.ImageSharp](https://github.com/SixLabors/ImageSharp) from 3.1.6 to 3.1.7.
- [Release notes](https://github.com/SixLabors/ImageSharp/releases)
- [Commits](SixLabors/ImageSharp@v3.1.6...v3.1.7)

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

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

Author: dependabot[bot]

samples/ComputeSharp.Benchmark/ComputeSharp.Benchmark.csproj

@@ -19,7 +19,7 @@
 
   <ItemGroup>
     <PackageReference Include="BenchmarkDotNet" Version="0.14.0" />
-    <PackageReference Include="SixLabors.ImageSharp" Version="3.1.6" />
+    <PackageReference Include="SixLabors.ImageSharp" Version="3.1.7" />
   </ItemGroup>
 
   <ItemGroup>