chore(deps): update dependency benchmarkdotnet to 0.15.6 (#1434)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

src/Benchmarks/Directory.Packages.props

@@ -4,7 +4,7 @@
     <CentralPackageTransitivePinningEnabled>trueCentralPackageTransitivePinningEnabled>
   PropertyGroup>
   <ItemGroup>
-    <PackageVersion Include="BenchmarkDotNet" Version="0.15.4" />
+    <PackageVersion Include="BenchmarkDotNet" Version="0.15.6" />
   ItemGroup>