Use `Typ.arrows` after the refactoring of arrow types. #7633

Job	Run time
build-compiler (macos-13, 5.3.0, true, darwin-x64, x86_64-apple-darwin)	5m 19s
build-compiler (ubuntu-24.04, ocaml-variants.5.3.0+options,ocaml-option-static, true, true, linux...	2m 28s
build-compiler (ubuntu-24.04-arm, ocaml-variants.5.3.0+options,ocaml-option-static, true, true, t...	3m 43s
build-compiler (macos-14, 5.3.0, true, darwin-arm64, aarch64-apple-darwin)	2m 28s
build-compiler (windows-latest, 5.3.0, true, win32-x64, x86_64-pc-windows-gnu)	3m 32s
build-compiler (ubuntu-24.04, ocaml-variants.5.0.0+options,ocaml-option-static, linux-x64, x86_64...	2m 4s
build-compiler (ubuntu-24.04, ocaml-variants.5.2.1+options,ocaml-option-static, linux-x64, x86_64...	2m 9s
build-compiler (ubuntu-24.04, ocaml-variants.4.14.2+options,ocaml-option-static, linux-x64, x86_6...	2m 26s
api-docs	2m 21s
pkg-pr-new	50s
test-installation-npm (macos-14)	16s
test-installation-npm (macos-13)	20s
test-installation-npm (ubuntu-24.04-arm)	15s
test-installation-npm (ubuntu-24.04)	17s
test-installation-npm (windows-latest)	49s
test-installation-pnpm (macos-13)	20s
test-installation-pnpm (ubuntu-24.04-arm)	17s
test-integration-rewatch (macos-14)	36s
test-installation-pnpm (macos-14)	16s
test-installation-pnpm (ubuntu-24.04)	14s
test-integration-rewatch (ubuntu-24.04)	33s
test-integration-rewatch (macos-13)	55s
test-integration-rewatch (ubuntu-24.04-arm)	36s
test-installation-pnpm (windows-latest)	30s
test-integration-rewatch (windows-latest)	1m 10s
publish	-1s
	34m 43s

Provide feedback