Bump actions/download-artifact from 4 to 5 #1335

Job	Run time
mypy	4m 42s
py3.13 \| ubuntu \| integration tests	17m 58s
py3.13 \| macos \| integration tests	18m 5s
py3.10 \| ubuntu \| integration tests	17m 56s
py3.13 \| macos \| unit tests	16m 14s
py3.13 \| windows \| unit tests	18m 55s
py3.11 \| ubuntu \| unit tests	14m 27s
py3.12 \| ubuntu \| unit tests	15m 38s
py3.13 \| windows \| integration tests	6h 0m 12s
py3.10 \| ubuntu \| unit tests	13m 54s
py3.13 \| ubuntu \| unit tests	13m 51s
merge-test-artifacts	0s
	8h 31m 52s

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