Fix wasm_of_ocaml version, hopefully (#1986) #756

Job	Run time
docker-master	1h 30m 16s
publish-standalone-dry-run	15s
test-standalone (master, dev, default)	1m 26s
build-wasm-of-ocaml (master, 4.14.1)	16m 59s
build-js-of-ocaml (master, 4.11.1)	12m 48s
generated-files (master)	54s
standalone-haskell (master)	44m 23s
test-amd64	2h 16m 30s
validate-docker-master	21m 53s
deploy-js-wasm-of-ocaml	1m 5s
docker-check-all	8s
	5h 26m 37s

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