chore(deps): update actions/checkout action to v6

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	major	v5 → v6

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Release Notes

actions/checkout (actions/checkout)

v6

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Slowest examples

Top 10 slowest examples (12.4 seconds, 63.43% of total time)

Example	Description	Time in seconds
spec/service_spec.rb:16	elasticsearch_service on Ubuntu 18.04 creates systemd unit with restart policy	2.12061
spec/user_spec.rb:15	test::user on Ubuntu 18.04 creates elasticsearch user deleteme in group foo	1.89913
spec/user_spec.rb:15	test::user on Centos 8 creates elasticsearch user deleteme in group foo	1.16191
spec/service_spec.rb:27	elasticsearch_service on Ubuntu 18.04 enables and starts the elasticsearch service	1.04523
spec/user_spec.rb:19	test::user on Centos 8 deletes user deleteme	1.03327
spec/service_spec.rb:27	elasticsearch_service on Centos 8 enables and starts the elasticsearch service	1.03069
spec/service_spec.rb:27	elasticsearch_service on Centos 7.8.2003 enables and starts the elasticsearch service	1.02915
spec/user_spec.rb:19	test::user on Ubuntu 20.04 deletes user deleteme	1.02773
spec/user_spec.rb:15	test::user on Ubuntu 20.04 creates elasticsearch user deleteme in group foo	1.02718
spec/service_spec.rb:27	elasticsearch_service on Ubuntu 20.04 enables and starts the elasticsearch service	1.02717