Bump rewriter from `3342e29` to `21b82e9` (#1819) #381

Job	Run time
docker-master	1h 37m 12s
publish-standalone-dry-run	15s
test-standalone (master, dev, default)	55s
validate-docker-master	32m 57s
build-js-of-ocaml (master, 4.11.1)	18m 18s
build-wasm-of-ocaml (master, 4.14.1)	13m 15s
standalone-haskell (master)	51m 30s
test-amd64	2h 18m 33s
generated-files (master)	41s
deploy-js-wasm-of-ocaml	27s
docker-check-all	8s
	5h 54m 11s

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