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 (0.32 seconds, 67.17% of total time)

Example	Description	Time in seconds
spec/unit/recipes/default_spec.rb:16	squid::default When all attributes are default, on an Ubuntu 20.04 installs package squid	0.04658
spec/unit/recipes/default_spec.rb:81	squid::default When all attributes are default, on an CentOS 8 templates /etc/squid/squid.conf without include directory	0.04022
spec/unit/recipes/default_spec.rb:46	squid::default When all attributes are default, on an Ubuntu 20.04 directory /etc/squid/conf.d/	0.03371
spec/unit/recipes/default_spec.rb:30	squid::default When all attributes are default, on an Ubuntu 20.04 templates /etc/squid/squid.conf icp deny all	0.03282
spec/unit/recipes/default_spec.rb:36	squid::default When all attributes are default, on an Ubuntu 20.04 templates /etc/squid/squid.conf without include directory	0.02892
spec/unit/recipes/default_spec.rb:24	squid::default When all attributes are default, on an Ubuntu 20.04 templates /etc/squid/squid.conf http deny all	0.02868
spec/unit/recipes/default_spec.rb:107	squid::default When all attributes are default, on an CentOS 8 With squid_acl databag entries templates /etc/squid/squid.conf with content http_access allow my-acl	0.02833
spec/unit/recipes/default_spec.rb:113	squid::default When all attributes are default, on an CentOS 8 With squid_acl databag entries templates /etc/squid/squid.conf with content http_access deny !my-acl	0.02805
spec/unit/recipes/default_spec.rb:69	squid::default When all attributes are default, on an CentOS 8 templates /etc/squid/squid.conf http deny all	0.02772
spec/unit/recipes/default_spec.rb:75	squid::default When all attributes are default, on an CentOS 8 templates /etc/squid/squid.conf icp deny all	0.02754