Bump BenchmarkDotNet

Bump BenchmarkDotNet to 0.15.2.

Author: martincostello

perf/TodoApp.Benchmarks/TodoApp.Benchmarks.csproj

@@ -9,6 +9,6 @@
   </ItemGroup>
   <ItemGroup>
     <FrameworkReference Include="Microsoft.AspNetCore.App" />
-    <PackageReference Include="BenchmarkDotNet" Version="0.15.1" />
+    <PackageReference Include="BenchmarkDotNet" Version="0.15.2" />
   </ItemGroup>
 </Project>