Update pgautoupgrade/pgautoupgrade Docker tag to v16

[renovate]

This PR contains the following updates:

Package	Update	Change
pgautoupgrade/pgautoupgrade	major	15-alpine3.8 -> 16-alpine3.8

---

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 this update again.

---

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

---

This PR was generated by Mend Renovate. View the repository job log.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (597aa68) to head (9e3b10a).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #206   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           21        21           
  Lines         1312      1312           
=========================================
  Hits          1312      1312           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.