Fix wasm_of_ocaml version, hopefully #754

Job	Run time
docker-master	1h 30m 22s
publish-standalone-dry-run	17s
test-standalone (master, dev, default)	1m 25s
build-js-of-ocaml (master, 4.11.1)	13m 11s
validate-docker-master	2m 25s
build-wasm-of-ocaml (master, 4.14.1)	16m 53s
generated-files (master)	23m 50s
standalone-haskell (master)	45m 21s
test-amd64	2h 16m 27s
deploy-js-wasm-of-ocaml	53s
docker-check-all	3s
	5h 31m 7s

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