[CI] [TEST] Pin lighter js_of_ocaml #599

Job	Run time
docker-master	1h 29m 15s
publish-standalone-dry-run	16s
test-standalone (master, dev, default)	1m 5s
build-js-of-ocaml (master, 4.11.1)	16m 8s
build-wasm-of-ocaml (master, 4.14.1)	2h 29m 15s
generated-files (master)	26m 54s
validate-docker-master	1m 54s
standalone-haskell (master)	46m 29s
test-amd64	2h 20m 29s
deploy-js-wasm-of-ocaml	38s
docker-check-all	2s
	7h 52m 25s

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