Bump the minimal version of `Dune` to `3.0` #30

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Run time

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Job	Run time
build (macos-latest, 4.08.1)	3m 10s
build (macos-latest, 5.0.0)	6m 0s
build (ubuntu-latest, 4.08.1)	2m 16s
build (ubuntu-latest, 5.0.0)	2m 34s
	14m 0s