usage of sqlalchemy in patterns documentation

[MohammadMMoniri]

If you are using SQLAlchemy version 2.0.0 or above and are following the Flask documentation on creating a base class for models using the declarative_base() function, you should be aware that this function is now deprecated and will be removed in a future release.

To address this issue, you can replace the use of declarative_base() with the new orm.declarative_base() function, which is available in SQLAlchemy 2.0.0 and above. This new function provides the same functionality as the old declarative_base() function but is not deprecated.

alert of SQLAlchemy:
MovedIn20Warning: The ``declarative_base()`` function is now available as sqlalchemy.orm.declarative_base(). (deprecated since: 2.0) (Background on SQLAlchemy 2.0 at: https://sqlalche.me/e/b8d9)

Environment:

• Python version: 3.10.6
• Flask version: 2.3.2
• SQLAlchemy: 2.0.16

[davidism]

Happy to review a PR