Bump actions/upload-artifact from 3 to 4 #6

Job	Run time
bookworm / build	17m 7s
bullseye / build	17m 39s
buster / build	17m 15s
bookworm / test (pi, run_installation_tests.sh)	9s
bookworm / test (pi, run_installation_tests2.sh)	17s
bookworm / test (pi, run_installation_tests3.sh)	13s
bookworm / test (hans, run_installation_tests.sh)	14s
bookworm / test (hans, run_installation_tests2.sh)	7s
bookworm / test (hans, run_installation_tests3.sh)	11s
buster / test (pi, run_installation_tests.sh)	11s
buster / test (pi, run_installation_tests2.sh)	12s
buster / test (pi, run_installation_tests3.sh)	6s
buster / test (hans, run_installation_tests.sh)	11s
buster / test (hans, run_installation_tests2.sh)	8s
buster / test (hans, run_installation_tests3.sh)	15s
bullseye / test (pi, run_installation_tests.sh)	17s
bullseye / test (pi, run_installation_tests2.sh)	6s
bullseye / test (pi, run_installation_tests3.sh)	11s
bullseye / test (hans, run_installation_tests.sh)	8s
bullseye / test (hans, run_installation_tests2.sh)	11s
bullseye / test (hans, run_installation_tests3.sh)	7s
bookworm / cleanup	0s
buster / cleanup	0s
bullseye / cleanup	0s
	55m 15s

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