Test

⬆ Bump actions/download-artifact from 6 to 8 #680

Job	Run time
test (windows-latest, 3.14, highest)	1m 29s
test (3.10, ubuntu-latest, lowest-direct)	37s
test (3.11, macos-latest, lowest-direct)	24s
test (macos-latest, 3.14, highest)	31s
test (ubuntu-latest, 3.14, highest)	33s
test (3.13, macos-latest, lowest-direct)	3m 6s
test (3.12, windows-latest, highest)	1m 39s
coverage-combine	22s
check	7s
	8m 48s

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