fix(fresh_dio): clone FormData on retry

[papertigify]

Problem

1. We make a multipart/form-data request.
2. The response returns an authorization token error.
3. Fresh 🍋 kicks in, successfully refreshes the token, and retries the request.
4. ❌ We get a Dio error:
   “The FormData has already been finalized. This typically means you are using the same FormData in repeated requests.”

Solution

Dio provides the FormData.clone() method, specifically designed to solve this issue. Dio documentation for the method states:
“Convenience method to clone finalized FormData when retrying requests.”

We just need to check the type of RequestOptions.data and call clone() if RequestOptions.data is FormData.

[papertigify]

@felangel the issue was previously discussed here #52

[felangel]

LGTM thanks so much for the contribution! 💙