ci(node-install): bump setup-node & pnpm/action-setup to v6 (Node.js 24)

[nrivera-sysdyne]

What

Bump the two actions used by the node-install composite action off their Node.js 20 versions:

• actions/setup-node@v4 → @v6 (latest: v6.4.0)
• pnpm/action-setup@v4 → @v6 (latest: v6.0.9)

Why

GitHub is retiring the Node.js 20 runner runtime. Both actions declared runs.using: node20, so every consuming repo's workflow logs a warning on each run:

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/setup-node@v4, pnpm/action-setup@v4.

The v6 majors of both actions run natively on Node.js 24, which clears the warning fleet-wide (this action is consumed via @master, so every repo picks up the fix automatically once merged).

Notes

• No input/behavior changes — the action still resolves the pnpm version from the packageManager field in package.json and the Node version from node-version-file: package.json.
• Consuming workflows already run on ubuntu-24.04, which provides the Node.js 24 runtime.

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