Bump the minimal version of `Dune` to `3.0` #31

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Run time

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Job	Run time
build (macos-latest, 4.08.1)	4m 3s
build (macos-latest, 5.0.0)	4m 8s
build (ubuntu-latest, 4.08.1)	2m 6s
build (ubuntu-latest, 5.0.0)	2m 14s
	12m 31s