Update puppet_forge requirement from >= 2.2, < 5 to >= 2.2, < 6

Updates the requirements on [puppet_forge](https://github.com/puppetlabs/forge-ruby) to permit the latest version.
- [Changelog](https://github.com/puppetlabs/forge-ruby/blob/main/CHANGELOG.md)
- [Commits](puppetlabs/forge-ruby@v2.2.0...v3.2.0)

---
updated-dependencies:
- dependency-name: puppet_forge
  dependency-type: direct:production
...

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

Author: dependabot[bot]

metadata_json_deps.gemspec

@@ -17,7 +17,7 @@ Gem::Specification.new do |s|
   # puppet_forge requires Ruby 2.4
   s.required_ruby_version = Gem::Requirement.new('>= 2.4.0')
 
-  s.add_runtime_dependency 'puppet_forge', '>= 2.2', '< 5'
+  s.add_runtime_dependency 'puppet_forge', '>= 2.2', '< 6'
   s.add_runtime_dependency 'puppet_metadata', '>= 0.3.0', '< 4'
 
   s.add_development_dependency 'rspec', '~> 3.0'