Update actions/checkout digest to b4ffde6 #109

Job	Run time
lint-unit / yamllint	11s
lint-unit / cookstyle	46s
lint-unit / check-metadata	4s
lint-unit / markdown-link-check	1m 54s
lint-unit / markdownlint-cli2	6s
lint-unit / rspec	45s
integration (almalinux-8, repository)	3m 15s
integration (almalinux-8, package)	2m 40s
integration (centos-7, repository)	3m 19s
integration (centos-7, package)	2m 53s
integration (centos-stream-8, repository)	4m 19s
integration (centos-stream-8, package)	4m 46s
integration (debian-10, repository)	2m 53s
integration (debian-10, package)	2m 46s
integration (debian-11, repository)	2m 19s
integration (debian-11, package)	2m 47s
integration (fedora-latest, repository)	3m 56s
integration (fedora-latest, package)	3m 50s
integration (rockylinux-8, repository)	3m 55s
integration (rockylinux-8, package)	3m 9s
integration (ubuntu-1804, repository)	2m 57s
integration (ubuntu-1804, package)	2m 32s
integration (ubuntu-2004, repository)	2m 43s
integration (ubuntu-2004, package)	2m 45s
	1h 1m 30s

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