Set version to 12.0.0-beta.12 #8460

Job	Run time
build-compiler (ubuntu-24.04, ocaml-variants.5.3.0+options,ocaml-option-static, true, true, linux...	4m 45s
build-compiler (ubuntu-24.04-arm, ocaml-variants.5.3.0+options,ocaml-option-static, true, true, t...	6m 9s
build-compiler (ubuntu-24.04, ocaml-variants.4.14.2+options,ocaml-option-static, linux-x64, x86_6...	5m 12s
build-compiler (windows-2022, 5.3.0, true, win32-x64, x86_64-pc-windows-gnu)	8m 32s
build-compiler (macos-14, 5.3.0, true, darwin-arm64, aarch64-apple-darwin)	6m 14s
build-compiler (macos-13, 5.3.0, true, darwin-x64, x86_64-apple-darwin)	9m 25s
pkg-pr-new	59s
api-docs	9s
test-installation-pnpm (macos-14)	20s
test-installation-pnpm (ubuntu-24.04)	14s
test-installation-pnpm (macos-13)	40s
test-integration-rewatch (macos-13)	1m 33s
test-installation-npm (ubuntu-24.04-arm)	18s
test-installation-npm (macos-13)	21s
test-integration-rewatch (ubuntu-24.04)	49s
test-installation-npm (ubuntu-24.04)	14s
test-installation-npm (windows-2022)	58s
test-installation-pnpm (windows-2022)	43s
test-integration-rewatch (macos-14)	1m 6s
test-integration-rewatch (ubuntu-24.04-arm)	49s
test-integration-rewatch (windows-2022)	1m 54s
test-installation-pnpm (ubuntu-24.04-arm)	19s
test-installation-npm (macos-14)	21s
publish	0s
	52m 4s

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