Update actions/download-artifact action to v8 #147

Job	Run time
Build per-arch (push by digest on main) (linux/amd64, ubuntu-24.04, linux-amd64, 8.5, pcntl xdebu...	20s
Build per-arch (push by digest on main) (linux/arm64, ubuntu-24.04-arm, linux-arm64, 8.1, pcntl x...	29s
Build per-arch (push by digest on main) (linux/amd64, ubuntu-24.04, linux-amd64, 8.3, pcntl xdebu...	28s
Build per-arch (push by digest on main) (linux/amd64, ubuntu-24.04, linux-amd64, 8.1, pcntl xdebu...	31s
Build per-arch (push by digest on main) (linux/arm64, ubuntu-24.04-arm, linux-arm64, 8.4, pcntl x...	28s
Build per-arch (push by digest on main) (linux/arm64, ubuntu-24.04-arm, linux-arm64, 8.5, pcntl x...	22s
Build per-arch (push by digest on main) (linux/arm64, ubuntu-24.04-arm, linux-arm64, 8.2, pcntl x...	30s
Build per-arch (push by digest on main) (linux/arm64, ubuntu-24.04-arm, linux-arm64, 8.3, pcntl x...	32s
Build per-arch (push by digest on main) (linux/amd64, ubuntu-24.04, linux-amd64, 8.2, pcntl xdebu...	18s
Build per-arch (push by digest on main) (linux/amd64, ubuntu-24.04, linux-amd64, 8.4, pcntl xdebu...	23s
Create multi-arch manifest (main only)	-1s
	4m 20s

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