Update actions/checkout action to v4 #149

Job	Run time
lint-unit / markdown-link-check	18s
lint-unit / cookstyle	40s
lint-unit / markdownlint-cli2	4s
lint-unit / check-metadata	4s
lint-unit / rspec	52s
lint-unit / yamllint	13s
integration (almalinux-8, package)	1m 50s
integration (almalinux-8, source)	3m 8s
integration (almalinux-8, check)	1m 45s
integration (centos-7, package)	2m 2s
integration (centos-7, source)	13m 58s
integration (centos-7, check)	6m 6s
integration (centos-stream-8, package)	3m 19s
integration (centos-stream-8, source)	3m 8s
integration (centos-stream-8, check)	3m 30s
integration (debian-10, package)	2m 17s
integration (debian-10, source)	4m 29s
integration (debian-10, check)	2m 17s
integration (debian-11, package)	1m 52s
integration (debian-11, source)	2m 41s
integration (debian-11, check)	1m 26s
integration (ubuntu-1804, package)	2m 6s
integration (ubuntu-1804, source)	3m 23s
integration (ubuntu-1804, check)	2m 2s
integration (ubuntu-2004, package)	2m 9s
integration (ubuntu-2004, source)	3m 18s
integration (ubuntu-2004, check)	2m 23s
integration (opensuse-leap-15, package)	1m 57s
integration (opensuse-leap-15, source)	5m 50s
integration (opensuse-leap-15, check)	2m 3s
integration (rockylinux-8, package)	1m 46s
integration (rockylinux-8, source)	5m 13s
integration (rockylinux-8, check)	1m 54s
	1h 30m 3s

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