chore(deps): update postgres docker tag to v18

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
postgres	service	major	16.0 → 18.4

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.72%. Comparing base (4c52549) to head (551178e).
⚠️ Report is 2 commits behind head on next.

Additional details and impacted files

@@           Coverage Diff           @@
##             next    #1486   +/-   ##
=======================================
  Coverage   89.72%   89.72%           
=======================================
  Files         177      177           
  Lines       26965    26965           
  Branches     2258     2258           
=======================================
  Hits        24195    24195           
  Misses       2770     2770           

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