Bump actions/checkout from 5.0.1 to 6.0.1 (#589) #1352

Job	Run time
lint (nightly)	26s
coverage	51s
ci (nightly, -Z direct-minimal-versions)	37s
ci (stable, --no-default-features, true)	19s
ci (nightly, --no-default-features --features std)	38s
ci (stable)	28s
ci (beta, --no-default-features --features std)	29s
ci (nightly)	36s
ci (beta)	29s
ci (1.83.0)	31s
ci (stable, --no-default-features --features std)	47s
	6m 11s

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