chore(deps): update node.js to v21 - autoclosed

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
docker.io/library/node	final	major	20.7.0-bullseye-slim -> 21.7.3-bullseye-slim
docker.io/library/node	stage	major	20.7.0-bullseye-slim -> 21.7.3-bullseye-slim
docker.io/library/node	final	major	20.7.0-alpine -> 21.7.3-alpine
docker.io/library/node	stage	major	20.7.0-alpine -> 21.7.3-alpine

---

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 these updates again.

---

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

---

This PR has been generated by Mend Renovate. View repository job log here.