chore(deps): update postgres docker tag to v18

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
postgres	service	major	17-alpine → 18-alpine
postgres		major	17-alpine → 18-alpine

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 43.30%. Comparing base (da5c70b) to head (c28ccf6).

❌ Your project check has failed because the head coverage (2.86%) is below the target coverage (80.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #5762   +/-   ##
=========================================
  Coverage     43.30%   43.30%           
  Complexity     6900     6900           
=========================================
  Files          2244     2244           
  Lines         61783    61783           
  Branches       8134     8134           
=========================================
  Hits          26755    26755           
  Misses        33304    33304           
  Partials       1724     1724           

Flag	Coverage Δ
backend	65.64% <ø> (ø)
e2e	18.13% <ø> (ø)
frontend	2.86% <ø> (ø)

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