ci: use refs/pull/*/merge to get head api.json

[anatawa12]

What

API.jsonを取得するときにrefs/pull/*/mergeを使用するようにします。

Why

baseの変更に起因するapi.jsonのdiffが発生しなく(しづらく)なります。

baseの変更に起因するapi.jsonの例: #12507 (comment)

developとの分岐点を #12507 と同じところにしたので多分二つで比較できると思います

Additional info (optional)

Checklist

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

[github-actions]

このPRによるapi.jsonの差分

差分はこちら

Get diff files from Workflow Page

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (4e5b776) 78.68% compared to head (1666938) 78.64%.
Report is 5 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #12508      +/-   ##
===========================================
- Coverage    78.68%   78.64%   -0.05%     
===========================================
  Files          951      949       -2     
  Lines       103427   103240     -187     
  Branches      8329     8328       -1     
===========================================
- Hits         81385    81195     -190     
- Misses       22042    22045       +3     

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[syuilo]

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