Bump actions/download-artifact from 3 to 4 #358

Job	Run time
release / Load build targets	5s
release_default / Load build targets	6s
release_sdist_only / Load build targets	0s
release_sdist_only / Build source distribution	0s
release_sdist_only / Build ${{ matrix.target }} wheels	0s
release_sdist_only / Upload	0s
release / Build source distribution	29s
release / Build linux wheels	8m 24s
release / Build cp38-macosx_x86_64 wheels	1m 20s
release / Build cp39-macosx_arm64 wheels	1m 46s
release / Build cp3?-win_amd64 wheels	3m 46s
release / Build cp39-manylinux_aarch64 wheels	2m 31s
release_default / Build linux wheels	8m 14s
release_default / Build source distribution	28s
release_default / Build macos wheels	5m 58s
release_default / Build windows wheels	10m 50s
release / Upload	0s
release_default / Upload	0s
	43m 57s

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