Update benchmark requirement from < 0.5 to < 0.6

Updates the requirements on [benchmark](https://github.com/ruby/benchmark) to permit the latest version.
- [Release notes](https://github.com/ruby/benchmark/releases)
- [Commits](ruby/benchmark@v0.1.0...v0.5.0)

---
updated-dependencies:
- dependency-name: benchmark
  dependency-version: 0.5.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

packaging.gemspec

@@ -18,7 +18,7 @@ Gem::Specification.new do |gem|
   gem.add_development_dependency('voxpupuli-rubocop', '~> 4.2.0')
   gem.add_dependency('artifactory', ['~> 3'])
   gem.add_dependency('base64', ['< 0.4'])
-  gem.add_dependency('benchmark', ['< 0.5'])
+  gem.add_dependency('benchmark', '< 0.6')
   gem.add_dependency('csv', ['~> 3.0'])
   gem.add_dependency('rake', ['>= 12.3'])
   gem.add_dependency('release-metrics')