chore: Dependabot で actions/* を minor/patch グループ化

[nanasess]

概要

EcAuth.IdpUtilities PR #3 のレビューコメント と同じ方針を本リポにも適用。Dependabot の github-actions エコシステムに groups 設定を追加する。

変更内容

groups:
  actions-minor-patch:
    patterns:
      - "actions/*"
    update-types:
      - "minor"
      - "patch"

動機

• 公式 Actions の minor/patch 更新を 1 PR に集約 することで PR ノイズを削減
• open-pull-requests-limit: 5 枠の節約
• CI 実行コスト・レビュー負荷の削減
• major update は個別 PR を維持 することで breaking change の見逃しを防ぐ

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: ab070e4e-b849-496a-953b-ead78aad1997

📥 Commits

Reviewing files that changed from the base of the PR and between a351b02 and da1411e.

📒 Files selected for processing (1)

• .github/dependabot.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/dependabot-grouping

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[gemini-code-assist]

Code Review

This pull request updates the Dependabot configuration in .github/dependabot.yml to group minor and patch updates for GitHub Actions into a single pull request, while maintaining individual pull requests for major updates. I have no feedback to provide.