chore(deps): update docker.io/postgres docker tag to v18

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This PR contains the following updates:

Package	Update	Change
docker.io/postgres	major	17 -> 18

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 19.52%. Comparing base (7707e84) to head (087554c).
⚠️ Report is 16 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5556      +/-   ##
==========================================
- Coverage   26.32%   19.52%   -6.80%     
==========================================
  Files         405      416      +11     
  Lines       29028    39567   +10539     
==========================================
+ Hits         7641     7726      +85     
- Misses      20688    31144   +10456     
+ Partials      699      697       -2     

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