Bump BenchmarkDotNet from 0.14.0 to 0.15.8 (#106)

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

Author: dependabot[bot]

Directory.Packages.props

@@ -22,7 +22,7 @@
   </ItemGroup>
   <!-- Benchmark dependencies -->
   <ItemGroup>
-    <PackageVersion Include="BenchmarkDotNet" Version="0.14.0" />
+    <PackageVersion Include="BenchmarkDotNet" Version="0.15.8" />
   </ItemGroup>
   <!-- SourceLink support -->
   <ItemGroup>