Bump actions/download-artifact from 8.0.0 to 8.0.1 #323

Job	Run time
config	21s
build (visionOS)	4m 36s
build (iOS)	4m 55s
build (macOS)	39s
build (watchOS)	5m 58s
build (tvOS)	5m 6s
Briefcase testbed (iOS)	5m 49s
CPython testbed (tvOS)	1m 33s
Cross-platform env test (x86_64-iphonesimulator)	15s
CPython testbed (visionOS)	2m 42s
Briefcase testbed (macOS)	1m 13s
Cross-platform env test (arm64-iphonesimulator)	19s
Cross-platform env test (arm64-iphoneos)	17s
CPython testbed (iOS)	11m 41s
	45m 24s

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