Migrate to httpx2

### Confirm this is a Python library issue and not an underlying Cloudflare API issue.

- [x] This is an issue with the Python library

### Describe the bug

This project currently depends on httpx, which is no longer maintained. Given that situation, it should be migrated away to a maintained http library. One such option is `httpx2` (https://github.com/pydantic/httpx2), which seems to be the accepted community fork of httpx, specially given it's maintained by pydantic. This is even more true, when the author of `httpxyz` (a previous fork) [blesses](https://tildeweb.nl/~michiel/httpx2.html) this new package.

Note that Sentry, already added support for this package in https://github.com/getsentry/sentry-python/issues/6448.

### To Reproduce

Check the project dependencies

### Code snippets

```Python

```

### OS

any

### Python version

any

### Library version

5.x

Comienza revisando las dependencias del proyecto para encontrar dónde se declara httpx y cómo se utiliza en la biblioteca de Python. Migra esas referencias al paquete mantenido httpx2 y, después, ejecuta la suite de pruebas existente de la biblioteca para confirmar que el cambio de dependencia funciona en todos los usos compatibles.

Escrito por el modelo de indexación a partir del texto del issue.