chore: リリースワークフローの更新と削除ファイルのgitattributesからの削除

[dotani1111]

• release.ymlのGitHub Actionsバージョンを更新（checkout@v6, upload-release-action@v2）
• .gitattributesから改善項目.mdのexport-ignore設定を削除

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📥 Commits

Reviewing files that changed from the base of the PR and between 60203d2 and 3a5b36d.

📒 Files selected for processing (2)

• .gitattributes
• .github/workflows/release.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feature/add-release-workflow

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