housekeeping: Update postgres Docker tag to v16

[renovate]

This PR contains the following updates:

Package	Update	Change
postgres	major	14-alpine -> 16-alpine

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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.

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[github-actions]

This PR has been marked as stale after 7 or more days of inactivity. Please have a maintainer add the on hold label if this PR should remain open. If there is no further activity or the on hold label is not added, this PR will be closed in 3 days.

[renovate]

Renovate Ignore Notification

Because you closed this PR without merging, Renovate will ignore this update. You will not get PRs for any future 16.x releases. But if you manually upgrade to 16.x then Renovate will re-enable minor and patch updates automatically.

If you accidentally closed this PR, or if you changed your mind: rename this PR to get a fresh replacement PR.