[Refactor] 축제 관련 api 변경에 따른 마이그레이션

[etama123]

#️⃣ 이슈 번호

#53

🛠️ 작업 내용

• 서버 마이그레이션에 따른 api 호출 부분을 변경했습니다.

🙇🏻 중점 리뷰 요청

• 안드 프로젝트도 업데이트된 내용으로 local.properties를 변경해주시기 바랍니다.
• kmp pr과 달리, 해당 레포지터리에서는 기존 도메인 구조를 수정하지 않았습니다.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch refactor/53

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