Bump BenchmarkDotNet from 0.13.2 to 0.15.6

---
updated-dependencies:
- dependency-name: BenchmarkDotNet
  dependency-version: 0.15.6
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

test/NosCore.PathFinder.Benchmark/NosCore.PathFinder.Benchmark/NosCore.PathFinder.Benchmark.csproj

@@ -6,7 +6,7 @@
 	</PropertyGroup>
 
 	<ItemGroup>
-		<PackageReference Include="BenchmarkDotNet" Version="0.13.2" />
+		<PackageReference Include="BenchmarkDotNet" Version="0.15.6" />
 	</ItemGroup>
 
 </Project>