fix: setup-python 제거, 시스템 python3 사용

.github/workflows/lotto-buy.yml

@@ -12,13 +12,8 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - name: Python 설정
-        uses: actions/setup-python@v5
-        with:
-          python-version: '3.12'
-
       - name: 의존성 설치
-        run: pip install -r requirements.txt
+        run: pip3 install -r requirements.txt
 
       - name: Chrome 설치
         uses: browser-actions/setup-chrome@v1
@@ -27,4 +22,4 @@ jobs:
         env:
           LOTTO_USER_ID: ${{ secrets.LOTTO_USER_ID }}
           LOTTO_USER_PW: ${{ secrets.LOTTO_USER_PW }}
-        run: python lotto_auto_buy.py
+        run: python3 lotto_auto_buy.py