chore: bump actions/checkout from 3 to 4 #87

Job	Run time
Preflight docs.rs build	2m 0s
Enforce Rust code format	12s
Clippy	45s
License / vulnerability audit (advisories)	25s
License / vulnerability audit (bans licenses sources)	23s
Preflight crate publish (ubuntu-latest, stable)	1m 8s
Unit tests with minimum versions of direct dependencies (windows-latest)	2m 14s
Unit tests (windows-latest, stable)	2m 55s
Unit tests with minimum versions of direct dependencies (macos-latest)	1m 3s
Unit tests (aarch64-unknown-linux-gnu, stable)	3m 59s
Unit tests (WASM)	2m 11s
Unit tests with minimum versions of direct dependencies (ubuntu-latest)	1m 6s
Unit tests (aarch64-unknown-linux-gnu, 1.76.0)	4m 1s
Unit tests (windows-latest, 1.76.0)	3m 19s
Check for unused dependencies	2m 10s
Unit tests (macos-latest, stable)	1m 6s
Unit tests (macos-latest, 1.76.0)	1m 14s
Unit tests (ubuntu-latest, stable)	2m 3s
Unit tests (ubuntu-latest, 1.76.0)	1m 59s
	34m 13s

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