Update dependency BenchmarkDotNet to v0.13.8

Author: renovate[bot]

Benchmarks/Boxed.Mapping.Benchmark/Boxed.Mapping.Benchmark.csproj

@@ -12,7 +12,7 @@
 
   <ItemGroup Label="Package References">
     <PackageReference Include="AutoMapper" Version="12.0.1" />
-    <PackageReference Include="BenchmarkDotNet" Version="0.13.6" />
+    <PackageReference Include="BenchmarkDotNet" Version="0.13.8" />
   </ItemGroup>
 
 </Project>