Running `bolt guide` with `rainbow` formatter causes crash

[op-ct]

Describe the Bug

Running bolt guide using the rainbow formatter causes a crash:

/opt/puppetlabs/bolt/lib/ruby/gems/3.2.0/gems/openbolt-5.5.0/lib/bolt/outputter/rainbow.rb:109:in `print_topics': undefined method `join' for {:topics=>["debugging", "inventory", "links", "logging", "module", "modulepath", "project", "targets", "transports"]}:Hash (NoMethodError)

        content += topics.join("\n")
                         ^^^^^
	from /opt/puppetlabs/bolt/lib/ruby/gems/3.2.0/gems/openbolt-5.5.0/lib/bolt/cli.rb:525:in `process_command'
	from /opt/puppetlabs/bolt/lib/ruby/gems/3.2.0/gems/openbolt-5.5.0/lib/bolt/cli.rb:466:in `block (2 levels) in execute'
	from /opt/puppetlabs/bolt/lib/ruby/gems/3.2.0/gems/openbolt-5.5.0/lib/bolt/cli.rb:873:in `with_error_handling'
	from /opt/puppetlabs/bolt/lib/ruby/gems/3.2.0/gems/openbolt-5.5.0/lib/bolt/cli.rb:340:in `block in execute'
	from /opt/puppetlabs/bolt/lib/ruby/gems/3.2.0/gems/openbolt-5.5.0/lib/bolt/cli.rb:890:in `with_signal_handling'
	from /opt/puppetlabs/bolt/lib/ruby/gems/3.2.0/gems/openbolt-5.5.0/lib/bolt/cli.rb:339:in `execute'
	from /opt/puppetlabs/bolt/lib/ruby/gems/3.2.0/gems/openbolt-5.5.0/exe/bolt:11:in `<top (required)>'
	from /opt/puppetlabs/bolt/bin/bolt:25:in `load'
	from /opt/puppetlabs/bolt/bin/bolt:25:in `<main>'

Expected Behavior

It should display the guide topics without problems

Steps to Reproduce

1. bolt --format rainbow guide

Environment

• Version: openbolt 5.5.0
• Platform: Fedora 43