Bump actions/download-artifact from 6 to 7 (#1057) #583

Job	Run time
Produce Pull Request payload artifact	4s
validation / lint	9s
unit-tests / unit-tests (ubuntu-latest, 3.9)	8s
unit-tests / unit-tests (windows-latest, 3.13)	11s
unit-tests / unit-tests (macos-latest, 3.9)	8s
unit-tests / unit-tests (windows-latest, 3.9)	10s
unit-tests / unit-tests (ubuntu-latest, 3.13)	8s
unit-tests / unit-tests (macos-latest, 3.13)	9s
unit-tests / tests-done	1s
	1m 8s

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