Update actions/upload-artifact action to v6 #535

Job	Run time
macos-latest (host=x64, target=x64)	1m 0s
windows-latest (host=x86, target=x86)	4m 48s
ubuntu-20.04 (host=x64, target=x64)	1s
macos-m1 (host=arm64, target=arm64)	1s
windows-latest (host=x64, target=x64)	3m 20s
${{ matrix.variant }} (node=${{ matrix.node }}, target=${{ matrix.target }})	0s
	9m 10s

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