feat(docker-image): update alpine docker tag to v3.20.0

[angelnu-bot[bot]]

This PR contains the following updates:

Package	Type	Update	Change
alpine	final	minor	3.19.1 -> 3.20.0

---

Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - "after 9am and before 6pm on Saturday" in timezone Europe/Berlin.

🚦 Automerge: Enabled.

♻ 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 has been generated by Renovate Bot.