Bump actions/download-artifact from 3 to 4 #121

Job	Run time
linux (x86_64)	1m 2s
linux (i686)	1m 13s
linux-cross (aarch64)	3m 22s
linux-cross (armv7)	3m 50s
macos	1m 18s
linux-cross (s390x)	3m 5s
linux-cross (ppc64le)	3m 51s
linux-cross (ppc64)	1m 37s
musllinux-cross (aarch64-unknown-linux-musl, aarch64)	1m 35s
musllinux-cross (armv7-unknown-linux-musleabihf, armv7)	1m 31s
windows (x64)	1m 21s
windows (x86)	1m 49s
musllinux (x86_64-unknown-linux-musl)	1m 4s
musllinux (i686-unknown-linux-musl)	59s
Release	0s
	27m 37s

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