update BenchmarkDotNet to 0.13.1 (#1274)

Author: SimonCropp

benchmarks/Sentry.Benchmarks/Sentry.Benchmarks.csproj

@@ -7,7 +7,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="BenchmarkDotNet" Version="0.12.1" />
+    <PackageReference Include="BenchmarkDotNet" Version="0.13.1" />
   </ItemGroup>
 
   <ItemGroup>