Bump actions/download-artifact and actions/upload-artifact from 3 to … #289

Job	Run time
docker-master	1h 32m 55s
publish-standalone-dry-run	14s
test-standalone (master, dev, default)	50s
validate-docker-master	33m 1s
build-js-of-ocaml (master, 4.11.1)	16m 23s
build-wasm-of-ocaml (master, 4.14.1)	12m 26s
standalone-haskell (master)	51m 32s
test-amd64	2h 18m 14s
generated-files (master)	30s
deploy-js-wasm-of-ocaml	41s
docker-check-all	2s
	5h 46m 48s

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