Revert to artifact upload/download to v3 for 2.8.0 release #6223

Job	Run time
build_docs	4m 16s
sdist_check_and_build	8m 21s
main_tests (ubuntu-latest, 3.10, true, true)	20m 50s
main_tests (ubuntu-latest, 3.11, true, true)	20m 27s
main_tests (ubuntu-latest, 3.12, true, true)	29m 0s
main_tests (ubuntu-latest, 3.13, false, true, python_313)	13m 18s
main_tests (macOS-12, 3.12, true, true, macOS_monterey_py311)	41m 37s
main_tests (macOS-14, 3.12, false, true, macOS_14_arm64_py312)	10m 8s
main_tests (ubuntu-latest, 3.10, false, true, numpy_min, numpy=1.23.2)	13m 39s
main_tests (ubuntu-latest, 3.10, true, false, asv_check, asv)	2m 37s
	2h 44m 13s

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