MINOR: [C#] Bump BenchmarkDotNet from 0.13.10 to 0.15.5#21

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dependabot/nuget/csharp/test/Apache.Arrow.Benchmarks/BenchmarkDotNet-0.15.5kumose/arrow:dependabot/nuget/csharp/test/Apache.Arrow.Benchmarks/BenchmarkDotNet-0.15.5Copy head branch name to clipboard