Bump actions/cache from 3 to 4 #573

Job	Run time
docker-master	1h 34m 20s
publish-standalone-dry-run	16s
test-standalone (master, dev, default)	1m 3s
build-js-of-ocaml (master, 4.11.1)	14m 51s
build-wasm-of-ocaml (master, 4.14.1)	14m 5s
generated-files (master)	26m 36s
validate-docker-master	2m 31s
test-amd64	2h 20m 47s
standalone-haskell (master)	52m 28s
deploy-js-wasm-of-ocaml	34s
docker-check-all	2s
	5h 47m 33s

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