chore(workflows): use postgres 15 everywhere

[saschanaz]

What

タイトル通り

Why

docker-compose_example.ymlでpostgres 15を使っているので同じものをテストでも使うように

Additional info (optional)

Checklist

• Read the contribution guide
• Test working in a local environment
• (If needed) Add story of storybook (N/A)
• (If needed) Update CHANGELOG.md (N/A)
• (If possible) Add tests (N/A)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (10d4ae1) 81.90% compared to head (57c7082) 81.90%.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop   #12726   +/-   ##
========================================
  Coverage    81.90%   81.90%           
========================================
  Files          180      180           
  Lines        27466    27466           
  Branches       511      511           
========================================
  Hits         22496    22496           
  Misses        4970     4970           

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[syuilo]

🙏