Update actions/checkout digest to b4ffde6 #114

Job	Run time
lint-unit / cookstyle	37s
lint-unit / rspec	59s
lint-unit / yamllint	10s
lint-unit / check-metadata	4s
lint-unit / markdown-link-check	19s
lint-unit / markdownlint-cli2	4s
integration (almalinux-8, repository)	3m 24s
integration (almalinux-8, package)	3m 5s
integration (centos-7, repository)	3m 20s
integration (centos-7, package)	2m 50s
integration (centos-stream-8, repository)	4m 46s
integration (centos-stream-8, package)	4m 8s
integration (debian-10, repository)	2m 26s
integration (debian-10, package)	2m 43s
integration (debian-11, repository)	2m 55s
integration (debian-11, package)	2m 26s
integration (fedora-latest, repository)	3m 38s
integration (fedora-latest, package)	3m 30s
integration (rockylinux-8, repository)	2m 58s
integration (rockylinux-8, package)	2m 42s
integration (ubuntu-1804, repository)	2m 27s
integration (ubuntu-1804, package)	2m 56s
integration (ubuntu-2004, repository)	2m 53s
integration (ubuntu-2004, package)	2m 26s
	57m 46s

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