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 (1.45 seconds, 50.87% of total time)

Example	Description	Time in seconds
spec/unit/recipes/install_spec.rb:58	haproxy_install compile HAProxy on AlmaLinux 10 (uses PCRE2) is expected to install package "["pcre2-devel", "openssl-devel", "zlib-devel", "systemd-devel", "tar"]"	0.35722
spec/unit/recipes/global_spec.rb:26	haproxy_config_global create haproxy config global is expected to render file "/etc/haproxy/haproxy.cfg"	0.1829
spec/unit/recipes/cache_spec.rb:45	haproxy_cache create a cache, frontend and backend and verify config is created properly is expected to render file "/etc/haproxy/haproxy.cfg"	0.15542
spec/unit/recipes/fastcgi_spec.rb:63	haproxy_fastcgi create a fastcgi resource, frontend and backend and verify config is created properly is expected to render file "/etc/haproxy/haproxy.cfg"	0.1304
spec/unit/recipes/install_spec.rb:12	haproxy_install install haproxy using the package method is expected to install package "haproxy"	0.12712
spec/unit/recipes/listen_spec.rb:61	haproxy_listen option parameter with array of options is expected to render file "/etc/haproxy/haproxy.cfg"	0.10743
spec/unit/recipes/peer_spec.rb:45	haproxy_peer create a peers section, frontend and backend and verify config is created properly is expected to render file "/etc/haproxy/haproxy.cfg"	0.10458
spec/unit/recipes/listen_spec.rb:106	haproxy_listen extra options http-request rule should be placed before use_backend rule is expected not to render file "/etc/haproxy/haproxy.cfg" with content /use_backend admin0 if path_beg /admin0.*http-request add-header Test Value/m	0.10346
spec/unit/recipes/defaults_spec.rb:26	haproxy_config_defaults create a cache, frontend and backend and verify config is created properly is expected to render file "/etc/haproxy/haproxy.cfg"	0.09225
spec/unit/recipes/mailer_spec.rb:48	haproxy_mailer create a mailer, frontend and backend and verify config is created properly is expected to render file "/etc/haproxy/haproxy.cfg"	0.08946