[Fix] CI SPM 캐시 경로 수정 및 actions 업데이트

[ddodle]

✨ PR 유형

어떤 변경 사항이 있나요??

• 빌드 부분 혹은 패키지 매니저 수정

🛠️ 작업내용

• actions/checkout v4 → v5 업데이트
• SPM 캐시 경로를 .spm-cache로 통일 (캐시 저장 경로와 xcodebuild 참조 경로 불일치 해결)
• xcodebuild에 -clonedSourcePackagesDirPath .spm-cache 추가하여 캐시 경로 고정

Closes #24

📋 추후 진행 상황

• CI 워크플로우 정상 동작 확인

📌 리뷰 포인트

• 캐시 경로 .spm-cache가 저장/복원/빌드 모두에서 일관되게 사용되는지 확인

✅ Checklist

• 커밋 메시지 컨벤션에 맞게 작성했습니다
• 유지-보수를 위해 주석처리를 잘 작성하였는가?

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

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Run ID: bed8248b-3fdf-4633-9a32-611072239cbd

📥 Commits

Reviewing files that changed from the base of the PR and between cf00a22 and 116ddd2.

📒 Files selected for processing (1)

• .github/workflows/iOS.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/ci-spm-cache

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