chore: Bump BenchmarkDotNet from 0.13.12 to 0.15.6

---
updated-dependencies:
- dependency-name: BenchmarkDotNet
  dependency-version: 0.15.6
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

AdvancedCsharpConcepts/AdvancedCsharpConcepts.csproj

@@ -14,7 +14,7 @@
     </PropertyGroup>
 
     <ItemGroup>
-        <PackageReference Include="BenchmarkDotNet" Version="0.13.12" />
+        <PackageReference Include="BenchmarkDotNet" Version="0.15.6" />
         <PackageReference Include="System.Threading.Tasks.Dataflow" Version="6.0.0" />
     </ItemGroup>