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ci: add macos-latest and drop Rust versions below 1.81 #5

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Run time

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Job	Run time
Rust 1.82, OCaml 4.14	5m 12s
Rust 1.81, OCaml 4.14	2h 38m 48s
Rust stable, OCaml 4.14	2h 38m 48s
	5h 22m 48s