Bump actions/download-artifact from 3 to 4 #5518

Job	Run time
code-quality	1m 30s
build packages	16s
unit test / python 3.8	1m 4s
unit test / python 3.9	1m 2s
unit test / python 3.10	1m 2s
unit test / python 3.11	1m 3s
verify packages / python 3.8 / ubuntu-latest	7s
verify packages / python 3.9 / ubuntu-latest	6s
verify packages / python 3.10 / ubuntu-latest	9s
verify packages / python 3.11 / ubuntu-latest	7s
verify packages / python 3.8 / macos-12	9s
verify packages / python 3.9 / macos-12	10s
verify packages / python 3.10 / macos-12	11s
verify packages / python 3.11 / macos-12	1m 19s
verify packages / python 3.8 / windows-latest	13s
verify packages / python 3.9 / windows-latest	14s
verify packages / python 3.10 / windows-latest	19s
verify packages / python 3.11 / windows-latest	13s
	9m 14s

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