Bump actions/download-artifact from 3 to 4 #155

Job	Run time
linux (libertem_dectris)	1m 52s
linux-test (libertem_dectris)	1m 28s
macos (libertem_dectris, x86_64)	5m 17s
linux (libertem_asi_tpx3)	1m 27s
macos-test (libertem_dectris)	1m 49s
linux-test (libertem_asi_tpx3)	49s
macos (libertem_dectris, aarch64)	3m 59s
linux-test (ipc_test)	41s
macos-test (libertem_asi_tpx3)	40s
macos (libertem_asi_tpx3, x86_64)	2m 46s
windows (libertem_dectris)	5m 57s
macos (libertem_asi_tpx3, aarch64)	2m 31s
windows (libertem_asi_tpx3)	4m 50s
windows-test (libertem_dectris)	3m 46s
windows-test (libertem_asi_tpx3)	2m 54s
windows-test (ipc_test)	2m 56s
Release	0s
	43m 42s

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