Update actions/checkout@v3 -> v4 #1802

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Run time

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Job	Run time
Clippy	35s
Outdated	20s
pre_ci / pre_ci	3s
Rust 1.52.0	2m 52s
Rust 1.51.0	2m 47s
Rust 1.50.0	2m 34s
Rust 1.42.0	2m 37s
Rust 1.39.0	2m 43s
Miri	1m 12s
Rust nightly	56s
Rust beta	39s
Rust stable	52s
Rust 1.65.0	2m 59s
Minimal versions	20s
Windows	1m 14s
	22m 43s