Set version to 12.0.0-rc.1 (#7938) #8683

Job	Run time
build-compiler (macos-15-intel, 5.3.0, true, darwin-x64, x86_64-apple-darwin)	12m 1s
build-compiler (windows-2022, 5.3.0, true, win32-x64, x86_64-pc-windows-gnu)	9m 16s
build-compiler (macos-15, 5.3.0, true, darwin-arm64, aarch64-apple-darwin)	5m 49s
build-compiler (ubuntu-24.04-arm, ocaml-variants.5.3.0+options,ocaml-option-static, true, true, t...	6m 32s
build-compiler (ubuntu-24.04, ocaml-variants.5.3.0+options,ocaml-option-static, true, true, linux...	5m 59s
build-compiler (ubuntu-24.04, ocaml-variants.4.14.2+options,ocaml-option-static, linux-x64, x86_6...	4m 43s
pkg-pr-new	54s
api-docs	9s
test-integration-rewatch (macos-15-intel)	3m 13s
test-integration-rewatch (macos-15)	1m 31s
test-integration-rewatch (ubuntu-24.04)	1m 23s
test-integration-rewatch (ubuntu-24.04-arm)	1m 8s
test-installation-pnpm (macos-15-intel)	30s
test-installation-pnpm (ubuntu-24.04)	16s
test-integration-rewatch (windows-2022)	2m 18s
test-installation-pnpm (macos-15)	14s
test-installation-pnpm (ubuntu-24.04-arm)	16s
test-installation-npm (ubuntu-24.04)	20s
test-installation-npm (windows-2022)	47s
test-installation-npm (macos-15)	18s
test-installation-npm (ubuntu-24.04-arm)	18s
test-installation-npm (macos-15-intel)	28s
test-installation-pnpm (windows-2022)	34s
publish	0s
	58m 57s

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