Miracleeeeee

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兼容Selenium截图规则消除Warning

在使用assert_template和airtest_touch时内部使用到了selenium的screenshot 在selenium内部针对图片截图建议使用.png格式图片 ![image](https://github.com/AirtestProject/airtest-selenium/assets/43941014/00303de7-1cf8-4373-b71e-37dfd426c66d) ![image](https://github.com/AirtestProject/airtest-selenium/assets/43941014/f00fbc31-3734-4164-8013-2d72bff6cca9) 故，该PR将所有jpg格式转为png格式来消除Warning ![image](https://github.com/AirtestProject/airtest-selenium/assets/43941014/cdc52dbf-2436-4366-b823-f6ecfbd80dbe)