chore(deps): update alpine:3.7 docker digest to 8421d9a - autoclosed

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
alpine	final	digest	9225145 -> 8421d9a

---

Configuration

📅 Schedule: At any time (no schedule defined).

🚦 Automerge: Disabled due to failing status checks.

♻ 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, click this checkbox.

---

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