fix: pnpm/action-setup@v4 should run before actions/setup-node@v5

[bolinfest]

rust-release.yml just failed:

https://github.com/openai/codex/actions/runs/18167317356/job/51714366768

The error is:

Error: Unable to locate executable file: pnpm. Please verify either the file path exists or the file can be found within a directory specified by the PATH environment variable. Also check the file mode to verify the file is executable.

We need to install pnpm first like we do in ci.yml:

codex/.github/workflows/ci.yml

Lines 17 to 25 in f815157

	- name: Setup pnpm
	uses: pnpm/action-setup@v4
	with:
	run_install: false
	- name: Setup Node.js
	uses: actions/setup-node@v5
	with:
	node-version: 22