更新 main.yml，升级 Python 版本至 3.12

Author: Viper373

.github/workflows/main.yml

@@ -13,7 +13,7 @@ jobs:
       - name: 设置 Python 环境
         uses: actions/setup-python@v4
         with:
-          python-version: '3.10'
+          python-version: '3.12'
       - name: 安装依赖
         run: |
           python -m pip install --upgrade pip