Flask-Admin wrongfully reported as python 3.11 compatible

[lachaib]

Hello,

After migration to Python 3.11, we encountered a bug because it still uses inspect.getargspec for a fallback behaviour on filters in https://github.com/flask-admin/flask-admin/blob/master/flask_admin/contrib/sqla/view.py (and maybe elsewhere), while is has been removed.

As a workaround we've upgraded our filters to support the alias parameter, but still this is something that needs to be fixed from this repository, given that pypi documents it as compatible with Python 3.11.

Would it be possible to update the code?
I may contribute if you'd need help.