ci: update `actions/checkout` action to v4 #197

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Run time

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Job	Run time
Test (stable)	3m 15s
Format	14s
Autobahn tests (stable)	1m 40s
Test MSRV (1.63.0)	2m 58s
Autobahn tests (beta)	1m 40s
Autobahn tests (nightly)	1m 37s
	11m 24s