🔧 chore: Python 버전을 3.11에서 3.x로 변경하여 setup-python 호환성 확보

.github/workflows/lotto-buy.yml

@@ -15,7 +15,7 @@ jobs:
       - name: Python 설정
         uses: actions/setup-python@v5
         with:
-          python-version: '3.11'
+          python-version: '3.x'
           cache: 'pip'
 
       - name: 의존성 설치