Bump BenchmarkDotNet from 0.13.8 to 0.13.9

Bumps [BenchmarkDotNet](https://github.com/dotnet/BenchmarkDotNet) from 0.13.8 to 0.13.9.
- [Release notes](https://github.com/dotnet/BenchmarkDotNet/releases)
- [Commits](dotnet/BenchmarkDotNet@v0.13.8...v0.13.9)

---
updated-dependencies:
- dependency-name: BenchmarkDotNet
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

src/Benchmark/Benchmark.csproj

@@ -11,7 +11,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="BenchmarkDotNet" Version="0.13.8" />
+    <PackageReference Include="BenchmarkDotNet" Version="0.13.9" />
     <PackageReference Include="NETStandard.Library" Version="2.0.3" />
   </ItemGroup>