Bump rewriter from `3342e29` to `21b82e9` #379

Job	Run time
docker-master	1h 40m 39s
publish-standalone-dry-run	14s
test-standalone (master, dev, default)	51s
validate-docker-master	1m 42s
build-wasm-of-ocaml (master, 4.14.1)	13m 16s
build-js-of-ocaml (master, 4.11.1)	17m 23s
standalone-haskell (master)	53m 17s
generated-files (master)	23m 43s
test-amd64	2h 17m 58s
deploy-js-wasm-of-ocaml	26s
docker-check-all	5s
	5h 49m 34s

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