Prepare for 13.0.0-alpha.2 release #9617

Job	Run time
test-devcontainer	17m 21s
build-compiler (ubuntu-24.04-arm, ocaml-variants.5.3.0+options,ocaml-option-static, true, true, t...	5m 27s
build-compiler (macos-15, 5.3.0, true, darwin-arm64, aarch64-apple-darwin)	6m 56s
build-compiler (windows-2025, 5.3.0, true, win32-x64, x86_64-pc-windows-gnu, .exe)	10m 21s
build-compiler (ubuntu-24.04, ocaml-variants.5.3.0+options,ocaml-option-static, true, true, linux...	4m 57s
build-compiler (ubuntu-24.04, ocaml-variants.5.0.0+options,ocaml-option-static, linux-x64, x86_64...	4m 55s
build-compiler (macos-15-intel, 5.3.0, true, darwin-x64, x86_64-apple-darwin)	11m 45s
api-docs	1m 48s
pkg-pr-new	54s
test-installation-npm (ubuntu-24.04)	13s
test-installation-npm (macos-15-intel)	23s
test-installation-npm (macos-15)	16s
test-installation-pnpm (macos-15)	20s
test-installation-pnpm (ubuntu-24.04-arm)	17s
test-installation-npm (windows-2025)	1m 4s
test-installation-pnpm (windows-2025)	31s
test-installation-pnpm (macos-15-intel)	21s
test-installation-npm (ubuntu-24.04-arm)	18s
test-integration-rewatch (macos-15-intel)	7m 17s
test-installation-pnpm (ubuntu-24.04)	12s
test-integration-rewatch (macos-15)	3m 43s
test-integration-rewatch (ubuntu-24.04-arm)	2m 55s
test-integration-rewatch (ubuntu-24.04)	3m 40s
test-integration-rewatch (windows-2025)	6m 57s
publish	0s
	1h 32m 51s

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