Update CI to setup-ocaml v3 #397

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Run time

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Job	Run time
Build (macos-13, 4.08)	4m 38s
Build (macos-13, 4.12)	6m 23s
Build (macos-13, 4.14)	6m 36s
Build (macos-13, 5.0)	5m 3s
Build (macos-13, 5.2)	5m 18s
Build (ubuntu-latest, 4.08)	2m 20s
Build (ubuntu-latest, 4.12)	2m 25s
Build (ubuntu-latest, 4.14)	2m 12s
Build (ubuntu-latest, 5.0)	2m 28s
Build (ubuntu-latest, 5.2)	2m 38s
Build (windows-latest, 4.14)	4m 39s
Build (windows-latest, 5.0)	4m 47s
Build (windows-latest, 5.2)	4m 53s
	54m 20s