Update actions/checkout action to v6 - autoclosed #549

Job	Run time
macos-latest (host=x64, target=x64)	47s
ubuntu-20.04 (host=x64, target=x64)	1s
windows-latest (host=x64, target=x64)	3m 5s
windows-latest (host=x86, target=x86)	3m 58s
macos-m1 (host=arm64, target=arm64)	1d 0h 0m 0s
${{ matrix.variant }} (node=${{ matrix.node }}, target=${{ matrix.target }})	0s
	1d 0h 7m 51s

Provide feedback