Bump actions/download-artifact from 1 to 4.1.7 in /.github/workflows #951

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Run time

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Job	Run time
build (macos-latest, 3.9, pyqt5)	3m 7s
build (macos-latest, 3.9, pyside2)	2m 2s
build (ubuntu-latest, 3.9, pyqt5)	3m 24s
build (ubuntu-latest, 3.9, pyside2)	1m 45s
build (windows-latest, 3.9, pyqt5)	8m 43s
build (windows-latest, 3.9, pyside2)	4m 32s
	23m 33s