[BUG] Create_team maintainers bug

The create_team function expects the maintainers to be list[int] but the api expects a list[str]:
https://github.com/PyGithub/PyGithub/blob/bdc58c3813a5beb32cc376de7822218266ab8620/github/Organization.py#L844


<img width="800" alt="Image" src="https://github.com/user-attachments/assets/f9f09e53-86b1-415c-a491-ba54e1989913" />
