Bump BenchmarkDotNet from 0.15.4 to 0.15.8#2295

dependabot[bot] wants to merge 1 commit intomaindotnet/reactive:mainfrom

dependabot/nuget/Ix.NET/Source/Benchmarks.System.Interactive/BenchmarkDotNet-0.15.8dotnet/reactive:dependabot/nuget/Ix.NET/Source/Benchmarks.System.Interactive/BenchmarkDotNet-0.15.8Copy head branch name to clipboard