Revert "[CI] Pin action steps that use setup-ocaml to ubuntu 22.04 (#… #744

Job	Run time
docker-master	1h 25m 27s
publish-standalone-dry-run	20s
test-standalone (master, dev, default)	1m 33s
build-js-of-ocaml (master, 4.11.1)	13m 15s
validate-docker-master	21m 26s
build-wasm-of-ocaml (master, 4.14.1)	17m 31s
standalone-haskell (master)	45m 57s
generated-files (master)	30s
test-amd64	2h 15m 18s
deploy-js-wasm-of-ocaml	54s
docker-check-all	3s
	5h 22m 14s

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