chore(docker): update postgres docker tag to v18

[renovate]

This PR contains the following updates:

Package	Update	Change
postgres	major	15.17 → 18.3

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.85%. Comparing base (c5784ec) to head (e099847).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #368      +/-   ##
==========================================
+ Coverage   83.61%   83.85%   +0.24%     
==========================================
  Files         110      110              
  Lines        4076     4076              
  Branches      369      369              
==========================================
+ Hits         3408     3418      +10     
+ Misses        574      563      -11     
- Partials       94       95       +1     

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[samtrion]

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