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 (0.11 seconds, 98.08% of total time)

Example	Description	Time in seconds
spec/shared_examples.rb:4	chrony_config :create action on AlmaLinux 9 (RHEL family) installs the chrony package	0.04204
spec/unit/resources/config_spec.rb:69	chrony_config :create action with server configuration (allow directives) renders allow directives	0.02238
spec/shared_examples.rb:4	chrony_config :create action on Ubuntu 24.04 (Debian family) installs the chrony package	0.02015
spec/unit/resources/config_spec.rb:84	chrony_config :delete action stops the chrony service	0.0158
spec/unit/resources/config_spec.rb:21	chrony_config :create action on AlmaLinux 9 (RHEL family) renders the config with default servers	0.00646
spec/unit/resources/config_spec.rb:55	chrony_config :create action on Ubuntu 24.04 (Debian family) uses Debian driftfile path	0.00591
spec/unit/resources/config_spec.rb:26	chrony_config :create action on AlmaLinux 9 (RHEL family) uses RHEL driftfile path	0.00079
spec/unit/resources/config_spec.rb:31	chrony_config :create action on AlmaLinux 9 (RHEL family) does not include allow directives for client config	0.00074
spec/unit/resources/config_spec.rb:36	chrony_config :create action on AlmaLinux 9 (RHEL family) includes extra_config lines	0.00071
spec/shared_examples.rb:8	chrony_config :create action on AlmaLinux 9 (RHEL family) creates the chrony configuration file	0.0004

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