workflows: Bump checkout to v4 #977

Job	Run time
OS (apt-docker.io/amd64/ubuntu:devel)	2m 12s
OS (apt-docker.io/amd64/ubuntu:latest)	2m 12s
OS (apt-docker.io/amd64/ubuntu:rolling)	1m 55s
OS (apt-docker.io/i386/debian:testing)	1m 41s
OS (apt-docker.io/amd64/debian:testing)	1m 54s
OS (dnf-registry.fedoraproject.org/fedora:latest)	2m 36s
OS (dnf-registry.fedoraproject.org/fedora:rawhide)	2m 8s
OS (alpine-docker.io/alpine)	30s
OS (alpine-docker.io/i386/alpine)	29s
OS ([email protected]/alpine)	30s
OS (nix-docker.io/nixos/nix)	53s
OS (gentoo-)	5m 20s
OS (alpine@gudev-alpine, EXTRA_PACKAGES=libgudev-dev)	32s
	22m 52s

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