Decide on http client dependencies

Requests does not support async requests. Making numtracker integration async (ACQP-436) would need `httpx` and it'd make sense to only have one library.

`aiohttp` could also be an alternative but is async only so would require further changes where as httpx supports both so would be a drop in replacement.

## Acceptance Criteria
- There is one http library in use in blueapi
- That library can make async requests

首先，盘点 blueapi 中当前对 HTTP 库的使用情况，并检查 ACQP-436 所引用的 numtracker 集成。将可用的异步选项与现有的同步用法进行比较，然后验证仍有一个库在使用中，并且能够支持所需的异步请求。

由索引模型根据 Issue 内容生成。