⬆️ Bump actions/download-artifact from 3 to 4 #12

Job	Run time
build-on-windows (windows-debug)	42s
build-on-linux (linux-kvm-debug)	55s
build-on-windows (windows-release)	44s
build-on-linux (linux-kvm-release)	51s
build-on-linux (linux-hyperv-debug)	55s
build-on-linux (linux-hyperv-release)	1m 5s
fuzzing / fuzz	9m 50s
rust / build (windows-2022-debug)	15m 17s
rust / build (linux-kvm-debug)	10m 11s
rust / build (linux-hyperv-debug)	9m 56s
rust / build (windows-2022-release)	19m 47s
rust / build (linux-kvm-release)	14m 20s
rust / build (linux-hyperv-release)	14m 8s
	1h 38m 41s

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