Rust

ci: Update to `actions/checkout@v4`. (#499) #300

Job	Run time
Build, minimum toolchain	5m 17s
Lints, pinned toolchain	4m 6s
Benchmarks (criterion)	10m 29s
Tests, unstable toolchain (beta)	1m 20s
Tests, stable toolchain	1m 48s
Tests, unstable toolchain (nightly)	1m 21s
	24m 21s

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