Bump BenchmarkDotNet from 0.13.5 to 0.13.6 (#1539)

Bumps [BenchmarkDotNet](https://github.com/dotnet/BenchmarkDotNet) from 0.13.5 to 0.13.6.
- [Release notes](https://github.com/dotnet/BenchmarkDotNet/releases)
- [Commits](dotnet/BenchmarkDotNet@v0.13.5...v0.13.6)

---
updated-dependencies:
- dependency-name: BenchmarkDotNet
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Refit.Benchmarks/Refit.Benchmarks.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
     <Import Project="..\Refit\targets\refit.props" />
 
@@ -18,7 +18,7 @@
 
     <ItemGroup>
       <PackageReference Include="AutoFixture" Version="4.18.0" />
-      <PackageReference Include="BenchmarkDotNet" Version="0.13.5" />
+      <PackageReference Include="BenchmarkDotNet" Version="0.13.6" />
     </ItemGroup>
 
     <ItemGroup>