Bump actions/setup-java from 4.1.0 to 4.2.1 (#1836) #403

Job	Run time
docker-master	1h 40m 6s
publish-standalone-dry-run	23s
test-standalone (master, dev, default)	1m 1s
build-wasm-of-ocaml (master, 4.14.1)	12m 34s
validate-docker-master	34m 34s
build-js-of-ocaml (master, 4.11.1)	14m 8s
generated-files (master)	1m 43s
standalone-haskell (master)	52m 24s
test-amd64	2h 20m 45s
deploy-js-wasm-of-ocaml	33s
docker-check-all	8s
	5h 58m 19s

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