[PUT] 유저 닉네임 변경

닉네임 변경

METHOD	PATH
PUT	/user/nickname

📌HEADERS - jwt

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📌REQUEST BODY

{
    "nickname": "사피엔스"
}

📌RESPONSE BODY

성공

{
    "status": 200,
    "success": true,
    "message": "닉네임 변경 성공",
    "data": {
        "id": 31,
        "nickname": "사피엔스"
    }
}

실패-already exists

{
    "status": 400,
    "success": false,
    "message": "이미 존재하는 닉네임 입니다."
}