Bump actions/download-artifact from 3 to 4 #151

Job	Run time
build (4.2.7, ghcr.io/wtsi-npg/ub-16.04-irods-clients-dev-4.2.7:latest, ghcr.io/wtsi-npg/ub-16.04...	2m 52s
build (4.2.7, ghcr.io/wtsi-npg/ub-16.04-irods-clients-dev-4.2.7:latest, ghcr.io/wtsi-npg/ub-16.04...	3m 51s
build (4.2.11, ghcr.io/wtsi-npg/ub-18.04-irods-clients-dev-4.2.11:latest, ghcr.io/wtsi-npg/ub-18....	2m 53s
build (4.2.11, ghcr.io/wtsi-npg/ub-18.04-irods-clients-dev-4.2.11:latest, ghcr.io/wtsi-npg/ub-18....	5m 40s
build (4.2.12, ghcr.io/wtsi-npg/ub-18.04-irods-clients-dev-4.2.12:latest, ghcr.io/wtsi-npg/ub-18....	2m 56s
build (4.2.12, ghcr.io/wtsi-npg/ub-18.04-irods-clients-dev-4.2.12:latest, ghcr.io/wtsi-npg/ub-18....	5m 47s
build (4.3.1, ghcr.io/wtsi-npg/ub-22.04-irods-clients-dev-4.3.1:latest, ghcr.io/wtsi-npg/ub-22.04...	2m 24s
build (4.3.1, ghcr.io/wtsi-npg/ub-22.04-irods-clients-dev-4.3.1:latest, ghcr.io/wtsi-npg/ub-22.04...	5m 39s
build (4.3-nightly, ghcr.io/wtsi-npg/ub-22.04-irods-clients-dev-4.3-nightly:latest, ghcr.io/wtsi-...	2m 29s
build (4.3-nightly, ghcr.io/wtsi-npg/ub-22.04-irods-clients-dev-4.3-nightly:latest, ghcr.io/wtsi-...	8m 3s
	42m 34s

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