chore(deps): update actions/setup-node action to v6

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/setup-node	action	major	v5 -> v6

---

Release Notes

actions/setup-node (actions/setup-node)

v6

Compare Source

---

Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• If you want to rebase/retry this PR, check this box

---

This PR was generated by Mend Renovate. View the repository job log.

[github-actions]

Visit the preview URL for this PR (updated for commit 643d06b):

https://vitepress-docs--pr908-renovate-actions-set-hekditc3.web.app

_{(expires Sun, 26 Oct 2025 03:27:51 GMT)}

_{🔥 via Firebase Hosting GitHub Action 🌎}

_{Sign: e4c5db1acb62b36273dc03718b86834917dea599}