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 (0.62 seconds, 32.42% of total time)

Example	Description	Time in seconds
spec/unit/recipes/default_spec.rb:255	ntp::default on CentOS 6 installs the ntp package	0.14607
spec/unit/recipes/apparmor_spec.rb:6	ntp::apparmor creates the apparmor file	0.07143
spec/unit/attributes_spec.rb:31	ntp attributes on an unknown platform sets the package list to ntp	0.06014
spec/unit/recipes/default_spec.rb:247	ntp::default the sync_hw_clock attribute is set on a Windows OS does not executes the "Force sync hardware clock with system clock" command	0.05814
spec/unit/recipes/default_spec.rb:84	ntp::default the ntp.conf creates the template	0.05354
spec/unit/recipes/default_spec.rb:88	ntp::default the ntp.conf has the chef marker and server entries	0.05029
spec/unit/recipes/default_spec.rb:69	ntp::default ntp["pools"] is used creates ntp.conf appropriately	0.04872
spec/unit/attributes_spec.rb:215	ntp attributes on the CentOS 7 platform sets the package list to include ntp and ntpdate	0.04786
spec/unit/recipes/default_spec.rb:339	ntp::default solaris2 installs the ntp package	0.04267
spec/unit/recipes/default_spec.rb:351	ntp::default solaris2 enables the ntp service	0.04261