Bump actions/download-artifact from 3 to 4 (#107) #864

Job	Run time
Build source distributions	13s
Build x86_64 wheels on ubuntu-20.04	2m 19s
Build i686 wheels on ubuntu-20.04	11m 28s
Build manylinux_aarch64 wheels on ubuntu-20.04	9m 59s
Build musllinux_aarch64 wheels on ubuntu-20.04	11m 4s
Build manylinux_ppc64le wheels on ubuntu-20.04	9m 33s
Build musllinux_ppc64le wheels on ubuntu-20.04	10m 10s
Build manylinux_s390x wheels on ubuntu-20.04	9m 15s
Build musllinux_s390x wheels on ubuntu-20.04	9m 45s
Build AMD64 wheels on windows-2019	6m 28s
Build x86 wheels on windows-2019	6m 31s
Build x86_64 universal2 arm64 wheels on macos-11	10m 44s
Check dist	2s
Upload release to PyPI	0s
	1h 37m 31s

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