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Update `actions/checkout` to v4 to stop node deprecation warnings #1220

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Run time

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Job	Run time
generate wheels matrix	8s
sdist + pure wheel	0s
mypyc wheels cp38-manylinux_x86_64	2m 21s
mypyc wheels cp312-manylinux_x86_64	2m 25s
Update stable branch	0s
	4m 54s