.to_dict() returns object

### 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

.to_dict() returns dict[str, object]:
https://github.com/cloudflare/cloudflare-python/blob/475b534aadd740ae087967be82040bf0b365f8b9/src/cloudflare/_models.py#L108

This obviously creates type errors any time a user tries to use any of the values. If possible, the class should be made generic to return a more accurate type. If not, then the type should be dict[str, Any] in order to not create a load of type errors in user's code.