Update CI to setup-ocaml v3 #395

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Run time

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Job	Run time
Build (macos-13, 4.08.x)	1s
Build (macos-13, 4.12.x)	1s
Build (macos-13, 4.14.x)	3m 51s
Build (macos-13, 5.0.0)	1s
Build (macos-13, 5.2.0)	1s
Build (ubuntu-latest, 4.08.x)	3m 51s
Build (ubuntu-latest, 4.12.x)	3m 50s
Build (ubuntu-latest, 4.14.x)	3m 50s
Build (ubuntu-latest, 5.0.0)	3m 49s
Build (ubuntu-latest, 5.2.0)	3m 51s
Build (windows-latest, 4.08.x)	3m 42s
Build (windows-latest, 4.12.x)	3m 44s
Build (windows-latest, 4.14.x)	3m 38s
Build (windows-latest, 5.0.0)	1m 4s
Build (windows-latest, 5.2.0)	1m 19s
	36m 33s