Bump actions/download-artifact from 3.0.2 to 4.2.1 #688

Job	Run time
test (3.9, py39, false)	43s
test (3.11, py311, false)	33s
test (3.12, py312, false)	45s
test (3.10, py310, false)	40s
test (3.13, flake8,doclint,docs,commitlint, false)	1m 31s
test (3.13, docstrings, true)	49s
test (3.13, py313, false)	49s
test (pypy3.9, pypy, false)	1m 53s
	7m 43s

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