update BenchmarkDotNet 0.15.2

Author: ikpil

tools/Box2D.NET.Benchmark/Box2D.NET.Benchmark.csproj

@@ -8,7 +8,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="BenchmarkDotNet" Version="0.15.1" />
+    <PackageReference Include="BenchmarkDotNet" Version="0.15.2" />
   </ItemGroup>
 
   <ItemGroup>