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

Compare Source

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Slowest examples

Top 10 slowest examples (0.94 seconds, 29.19% of total time)

Example	Description	Time in seconds
spec/unit/resources/site_spec.rb:32	nginx_site with template is expected to create template "/etc/nginx/conf.http.d/default.conf"	0.24094
spec/unit/resources/install_spec.rb:14	nginx_install with default properties with repo source with centos platform is expected to do nothing	0.12971
spec/unit/resources/install_spec.rb:22	nginx_install with default properties with repo source with amazon platform is expected to notify "ohai[nginx]" with action :reload immediately	0.09237
spec/unit/resources/config_spec.rb:52	nginx_config with default properties is expected to create directory "/etc/nginx/conf.http.d"	0.07442
spec/unit/resources/install_spec.rb:22	nginx_install with default properties with epel source with amazon platform is expected to notify "ohai[nginx]" with action :reload immediately	0.07349
spec/unit/resources/config_spec.rb:17	nginx_config with default properties is expected to create template "/etc/nginx/nginx.conf"	0.0703
spec/unit/resources/install_spec.rb:72	nginx_install with default properties with repo source with ubuntu platform is expected to add apt_repository "nginx"	0.07022
spec/unit/resources/install_spec.rb:22	nginx_install with default properties with epel source with centos 8 platform is expected to notify "ohai[nginx]" with action :reload immediately	0.06541
spec/unit/resources/install_spec.rb:15	nginx_install with default properties with distro source with ubuntu platform is expected to create template "(?-mix:/ohai/plugins/nginx.rb)"	0.06336
spec/unit/resources/install_spec.rb:22	nginx_install with default properties with epel source with centos-stream 9 platform is expected to notify "ohai[nginx]" with action :reload immediately	0.06312