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 (2.19 seconds, 99.66% of total time)

Example	Description	Time in seconds
spec/unit/recipes/default_spec.rb:11	default recipe on ubuntu 20.04 installs the openldap server packages	0.80865
spec/unit/recipes/default_spec.rb:91	default recipe on centos 8 installs the openldap server package	0.47065
spec/unit/recipes/default_spec.rb:49	default recipe on centos 7 installs the openldap server package	0.46379
spec/unit/recipes/default_spec.rb:139	default recipe on freebsd 12 installs the openldap server package	0.44046
spec/unit/recipes/default_spec.rb:7	default recipe on ubuntu 20.04 converges successfully	0.00925
spec/unit/recipes/default_spec.rb:19	default recipe on ubuntu 20.04 installs the dbd package	0.00054
spec/unit/recipes/default_spec.rb:23	default recipe on ubuntu 20.04 is expected to create template "/etc/default/slapd"	0.00053
spec/unit/recipes/default_spec.rb:117	default recipe on centos 8 is expected to create template "/etc/openldap/slapd.conf"	0.00044
spec/unit/recipes/default_spec.rb:65	default recipe on centos 7 is expected to create template "/etc/sysconfig/slapd"	0.00043
spec/unit/recipes/default_spec.rb:53	default recipe on centos 7 installs the openldap client packages	0.00043