Set version to 12.0.0-rc.1 #8682

Job	Run time
build-compiler (macos-15, 5.3.0, true, darwin-arm64, aarch64-apple-darwin)	6m 18s
build-compiler (ubuntu-24.04-arm, ocaml-variants.5.3.0+options,ocaml-option-static, true, true, t...	6m 23s
build-compiler (windows-2022, 5.3.0, true, win32-x64, x86_64-pc-windows-gnu)	8m 14s
build-compiler (ubuntu-24.04, ocaml-variants.4.14.2+options,ocaml-option-static, linux-x64, x86_6...	4m 57s
build-compiler (ubuntu-24.04, ocaml-variants.5.3.0+options,ocaml-option-static, true, true, linux...	5m 16s
build-compiler (macos-15-intel, 5.3.0, true, darwin-x64, x86_64-apple-darwin)	15m 1s
api-docs	7s
pkg-pr-new	58s
test-installation-npm (macos-15)	17s
test-installation-npm (ubuntu-24.04)	15s
test-installation-npm (windows-2022)	1m 59s
test-installation-pnpm (macos-15)	26s
test-installation-pnpm (ubuntu-24.04)	17s
test-installation-pnpm (macos-15-intel)	31s
test-installation-npm (macos-15-intel)	29s
test-integration-rewatch (macos-15-intel)	2m 24s
test-installation-pnpm (ubuntu-24.04-arm)	19s
test-installation-npm (ubuntu-24.04-arm)	20s
test-integration-rewatch (macos-15)	1m 49s
test-installation-pnpm (windows-2022)	38s
test-integration-rewatch (ubuntu-24.04-arm)	1m 8s
test-integration-rewatch (windows-2022)	2m 29s
test-integration-rewatch (ubuntu-24.04)	1m 24s
publish	0s
	1h 1m 59s

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