Bump BenchmarkDotNet from 0.15.5 to 0.15.6

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

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

Author: dependabot[bot]

src/Benchmarks/Benchmarks.csproj

@@ -9,7 +9,7 @@
 	</PropertyGroup>
 
 	<ItemGroup>
-		<PackageReference Include="BenchmarkDotNet" Version="0.15.5" />
+		<PackageReference Include="BenchmarkDotNet" Version="0.15.6" />
 	</ItemGroup>
 
 	<ItemGroup>