text: Title: Inheriting UserMixin class from flask-login library on SQLModel model crashes the app 
  Body: ### First Check
  
  - [X] I added a very descriptive title to this issue.
  - [X] I used the GitHub search to find a similar issue and didn't find it.
  - [X] I searched the SQLModel documentation, with the integrated search.
  - [X] I already searched in Google "How to X in SQLModel" and didn't find any information.
  - [X] I already read and followed all the tutorial in the docs and didn't find an answer.
  - [X] I already checked if it is not related to SQLModel but to [Pydantic](https://github.com/samuelcolvin/pydantic).
  - [X] I already checked if it is not related to SQLModel but to [SQLAlchemy](https://github.com/sqlalchemy/sqlalchemy).
  
  ### Commit to Help
  
  - [X] I commit to help with one of those options 👆
  
  ### Example Code
  
  ```python
  from flask import Flask
  from sqlmodel import SQLModel, Field, create_engine
  from flask_login import UserMixin
  
  class Account(UserMixin, SQLModel, table=True):
      id: int | None = Field(default=None, primary_key=True)
      name: str
      scotia_id: str = Field(unique=True)
      email: str = Field(unique=True)
      password: str
  
  
  engine = create_engine('sqlite:///site.db')
  SQLModel.metadata.create_all(engine)
  
  app = Flask(__name__)
  if __name__ == '__main__':
      app.run(debug=True)
  ```
  
  
  ### Description
  
  (project) ➜  project python test.py
  Traceback (most recent call last):
    File "/home/johnny/project/test.py", line 5, in <module>
      class Account(UserMixin, SQLModel, table=True):
    File "/home/johnny/.local/share/virtualenvs/project-ABytqz7n/lib64/python3.10/site-packages/sqlmodel/main.py", line 322, in __init__
      config = getattr(base, "__config__")
  AttributeError: type object 'UserMixin' has no attribute '__config__'
  
  ### Operating System
  
  Linux
  
  ### Operating System Details
  
  Fedora 36 Gnome Desktop
  
  ### SQLModel Version
  
  0.0.8
  
  ### Python Version
  
  Python 3.10.7
  
  ### Additional Context
  
  _No response_