🚀 Feature: Update appwrite package

### 🔖 Feature description

The appwrite package used in this playground is quite old.

### 🎤 Pitch

The package should be updated so it can easily be run against cloud.

In addition, the endpoint should be defaulted to cloud.

### 👀 Have you spent some time to check if this issue has been raised before?

- [X] I checked and didn't find similar issue

### 🏢 Have you read the Code of Conduct?

- [X] I have read the [Code of Conduct](https://github.com/appwrite/appwrite/blob/HEAD/CODE_OF_CONDUCT.md)

issue 中没有指定文件或测试。首先定位 Python 依赖声明和 Appwrite endpoint 配置，然后检查 playground 示例如何初始化 client。当 package 更新完成且 endpoint 默认指向 Appwrite Cloud 时，即可视为完成。

由索引模型根据 Issue 内容生成。