chore(deps): update postgres docker tag to v18

[renovate]

This PR contains the following updates:

Package	Update	Change
postgres	major	17.9-alpine → 18.4-alpine

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Latest commit: c478301

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 46.21%. Comparing base (3653df2) to head (c478301).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #507   +/-   ##
=======================================
  Coverage   46.21%   46.21%           
=======================================
  Files          70       70           
  Lines        1216     1216           
  Branches       75       81    +6     
=======================================
  Hits          562      562           
  Misses        643      643           
  Partials       11       11           

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