chore(deps): update dependency benchmarkdotnet to 0.15.8

Author: renovate[bot]

Directory.Packages.props

@@ -3,7 +3,7 @@
     <ManagePackageVersionsCentrally>true</ManagePackageVersionsCentrally>
   </PropertyGroup>
   <ItemGroup>
-    <PackageVersion Include="BenchmarkDotNet" Version="0.15.7" />
+    <PackageVersion Include="BenchmarkDotNet" Version="0.15.8" />
     <PackageVersion Include="BouncyCastle.Cryptography" Version="2.6.2" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.0.1" />
     <PackageVersion Include="Microsoft.SourceLink.GitHub" Version="8.0.0" />