chore: bump actions/checkout from 3 to 4 #85

Job	Run time
Clippy	39s
License / vulnerability audit (advisories)	24s
Enforce Rust code format	12s
License / vulnerability audit (bans licenses sources)	27s
Preflight docs.rs build	1m 59s
Preflight crate publish (ubuntu-latest, stable)	1m 12s
Unit tests with minimum versions of direct dependencies (windows-latest)	2m 19s
Unit tests (windows-latest, stable)	3m 36s
Unit tests with minimum versions of direct dependencies (macos-latest)	1m 4s
Unit tests (windows-latest, 1.76.0)	3m 0s
Unit tests (aarch64-unknown-linux-gnu, stable)	4m 7s
Unit tests (WASM)	1m 56s
Unit tests with minimum versions of direct dependencies (ubuntu-latest)	1m 2s
Unit tests (macos-latest, stable)	1m 6s
Unit tests (aarch64-unknown-linux-gnu, 1.76.0)	4m 15s
Unit tests (macos-latest, 1.76.0)	1m 21s
Check for unused dependencies	2m 4s
Unit tests (ubuntu-latest, stable)	2m 0s
Unit tests (ubuntu-latest, 1.76.0)	2m 10s
	34m 53s

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