Bump actions/download-artifact from 3 to 4 #7654

Job	Run time
code-quality	1m 3s
build packages	16s
unit test / python 3.9	50s
unit test / python 3.10	57s
unit test / python 3.11	53s
unit test / python 3.12	1m 0s
verify packages / python 3.9 / ubuntu-22.04	5s
verify packages / python 3.10 / ubuntu-22.04	8s
verify packages / python 3.11 / ubuntu-22.04	4s
verify packages / python 3.12 / ubuntu-22.04	4s
verify packages / python 3.10 / macos-14	7s
verify packages / python 3.11 / macos-14	7s
verify packages / python 3.12 / macos-14	7s
verify packages / python 3.9 / windows-2022	11s
verify packages / python 3.10 / windows-2022	10s
verify packages / python 3.11 / windows-2022	12s
verify packages / python 3.12 / windows-2022	19s
	6m 33s

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