Bump actions/download-artifact from 7.0.0 to 8.0.0 #4367

Job	Run time
build-and-test-minimal	1m 27s
format	5s
compliance-tests	5m 7s
compliance-tests-detect-changes	7s
check-bindings	1m 26s
build-and-test-msrv	1m 37s
build-and-test-fedora	1m 23s
e2e-tests	1m 7s
build-and-test-32bit	1m 35s
gettext	16s
build-and-test	2m 5s
build-and-test-alpine	1m 43s
clippy	11s
compliance-tests-lint	0s
compliance-tests-og	0s
docs	11s
audit	10s
miri	44s
	19m 14s

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