meta: bump actions/download-artifact from 6.0.0 to 7.0.0 #1971

Job	Run time
Build slim tarball	1m 28s
x86_64-darwin: with shared libraries	39m 10s
x86_64-linux: with shared libraries	29m 18s
aarch64-darwin: with shared libraries	33m 40s
aarch64-linux: with shared libraries	24m 41s
	2h 8m 17s

Provide feedback