Bump actions/upload-artifact from 3 to 4 #167

Job	Run time
check (3.8)	39s
check-distro (debian:unstable)	1m 25s
check (3.9)	40s
workflow-keepalive	0s
check-distro (debian:testing)	1m 9s
check (3.10)	37s
check-distro (debian:stable)	1m 27s
check (3.11)	39s
check-distro (debian:oldstable)	1m 11s
check (3.12)	1m 2s
check-distro (ubuntu:devel)	1m 51s
check-distro (ubuntu:rolling)	1m 4s
check-distro (ubuntu:latest)	1m 10s
	12m 54s

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