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 (10.31 seconds, 84.87% of total time)

Example	Description	Time in seconds
spec/unit/recipes/centos_spec.rb:13	default recipe on CentOS should template fail2ban.conf	1.47662
spec/unit/recipes/default_spec.rb:15	fail2ban::default converge installs the fail2ban package	1.14785
spec/unit/recipes/default_spec.rb:23	fail2ban::default converge should template fail2ban.conf	0.99817
spec/unit/recipes/default_spec.rb:30	fail2ban::default converge should template jail.local with the default action	0.99484
spec/unit/recipes/default_spec.rb:19	fail2ban::default converge should not install the curl package	0.99027
spec/unit/recipes/default_spec.rb:36	fail2ban::default converge reload service on config change	0.94649
spec/unit/recipes/default_spec.rb:49	fail2ban::default converge should not templates slack script file	0.94531
spec/unit/recipes/default_spec.rb:70	fail2ban::default converge with a given slack webhook installs the fail2ban package	0.94127
spec/unit/recipes/default_spec.rb:45	fail2ban::default converge should not templates action.d file	0.93947
spec/unit/recipes/default_spec.rb:78	fail2ban::default converge with a given slack webhook should template fail2ban.conf	0.93733