renovate: Update backup-duplicity commit hash to 385b6bd

This MR contains the following updates:

Package	Update	Change
backup-duplicity	digest	813637f -> 385b6bd

---

Configuration

📅 Schedule: 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 this update again.

---

This MR has been generated by Renovate Bot. The local configuration can be found in the local Renovate Bot repository.