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 (2.65 seconds, 13.05% of total time)

Example	Description	Time in seconds
spec/resources/vrrp_instance_spec.rb:162	keepalived_vrrp_instance on ubuntu When given inputs for advert_int, authentication, virtual_ipaddress, virtual_ipaddress_excluded, virtual_routes and virtual_rules should render a config file with the advert_int correctly	0.42076
spec/resources/vrrp_sync_group_spec.rb:29	keepalived_vrrp_sync_group on centos Create a base config correctly creates the config file with the owner, group and mode	0.31678
spec/resources/static_routes_spec.rb:23	keepalived_static_routes on debian Create a base config correctly should render an empty config file	0.29006
spec/resources/virtual_server_group_spec.rb:24	keepalived_virtual_server_group on ubuntu Create a base config correctly should render an empty config file	0.28815
spec/resources/virtual_server_spec.rb:158	keepalived_virtual_server on centos When given inputs for persistence_engine, persistence_timeout and persistence_granularity should render a config file with the persistence_timeout correctly	0.2836
spec/resources/smtp_check_spec.rb:74	keepalived_smtp_check on centos When given inputs for connect_ip, connect_port and connect_timeout should render a config file with the connect_ip correctly	0.23031
spec/resources/vrrp_sync_group_spec.rb:25	keepalived_vrrp_sync_group on centos Create a base config correctly should render an empty config file	0.21558
spec/resources/misc_check_spec.rb:50	keepalived_misc_check on centos When given inputs for misc_path, misc_timeout warmup and misc_dynamic should render a config file	0.21518
spec/resources/http_get_spec.rb:24	keepalived_http_get on ubuntu Create a base config correctly should render an empty config file	0.20298
spec/resources/global_defs_spec.rb:80	keepalived_global_defs on centos Create a config with vrrp settings should render config file with the vrrp sections is expected to render file "/etc/keepalived/conf.d/global_defs.conf"	0.1908