Set version to 12.0.0-rc.4 (#7991) #8825

Job	Run time
build-compiler (macos-15, 5.3.0, true, darwin-arm64, aarch64-apple-darwin)	6m 9s
build-compiler (ubuntu-24.04-arm, ocaml-variants.5.3.0+options,ocaml-option-static, true, true, t...	6m 4s
build-compiler (windows-2022, 5.3.0, true, win32-x64, x86_64-pc-windows-gnu)	9m 3s
build-compiler (ubuntu-24.04, ocaml-variants.4.14.2+options,ocaml-option-static, linux-x64, x86_6...	5m 21s
build-compiler (macos-15-intel, 5.3.0, true, darwin-x64, x86_64-apple-darwin)	16m 8s
build-compiler (ubuntu-24.04, ocaml-variants.5.3.0+options,ocaml-option-static, true, true, linux...	5m 12s
pkg-pr-new	54s
api-docs	8s
test-installation-pnpm (macos-15-intel)	31s
test-integration-rewatch (macos-15-intel)	3m 20s
test-installation-pnpm (ubuntu-24.04)	12s
test-integration-rewatch (macos-15)	1m 53s
test-installation-pnpm (macos-15)	19s
test-installation-npm (macos-15-intel)	32s
test-installation-pnpm (ubuntu-24.04-arm)	16s
test-integration-rewatch (ubuntu-24.04)	1m 21s
test-installation-npm (macos-15)	21s
test-integration-rewatch (windows-2022)	2m 30s
test-installation-npm (ubuntu-24.04)	19s
test-integration-rewatch (ubuntu-24.04-arm)	1m 10s
test-installation-pnpm (windows-2022)	1m 19s
test-installation-npm (windows-2022)	53s
test-installation-npm (ubuntu-24.04-arm)	17s
publish	0s
	1h 4m 12s

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