chore(deps): update postgres docker tag to v18

[renovate-bot]

This PR contains the following updates:

Package	Update	Change
postgres	major	16 → 18

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[bhearsum]

prod runs 16; we don't want to take this unless we upgrade prod

[forking-renovate]

Renovate Ignore Notification

Because you closed this PR without merging, Renovate will ignore this update. You will not get PRs for any future 18.x releases. But if you manually upgrade to 18.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.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.25%. Comparing base (241a513) to head (1c045fe).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1495   +/-   ##
=======================================
  Coverage   76.25%   76.25%           
=======================================
  Files          17       17           
  Lines        1777     1777           
  Branches      122      122           
=======================================
  Hits         1355     1355           
  Misses        360      360           
  Partials       62       62           

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