Bump BenchmarkDotNet from 0.14.0 to 0.15.8

---
updated-dependencies:
- dependency-name: BenchmarkDotNet
  dependency-version: 0.15.8
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Directory.Packages.props

@@ -62,7 +62,7 @@
 
   <!-- Testing Frameworks & Analysis Packages -->
   <ItemGroup>
-    <PackageVersion Include="BenchmarkDotNet" Version="0.14.0" />
+    <PackageVersion Include="BenchmarkDotNet" Version="0.15.8" />
     <PackageVersion Include="FluentAssertions" Version="6.12.1" />
     <PackageVersion Include="FluentAssertions.Analyzers" Version="0.34.1"/>
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.11.1" />