Update alpine:3.20 Docker digest to 31687a2

This MR contains the following updates:

Package	Type	Update	Change
alpine	final	digest	0a4eaa0 -> 31687a2
alpine	stage	digest	0a4eaa0 -> 31687a2

---

⚠️ Warning

Some dependencies could not be looked up. Check the Dependency Dashboard for more information.

---

Configuration

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

🚦 Automerge: Enabled.

♻️ Rebasing: Whenever MR is behind base branch, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this MR and you won't be reminded about these updates again.

---

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

---

This MR has been generated by Renovate Bot.