[Request] Implement compatibility for Flask 3.0.2

[futuremotiondev]

Environment

Flask-Appbuilder version: 4.4.1

Describe the expected results

Flask-Appbuilder should install without complaint alongside of Flask 3.0.2

pip install -U flask
pip install flask-appbuilder

Describe the actual results

PIP complains.

ERROR: pip's dependency resolver does not currently take into account all the packages that are installed. This behaviour is the source of the following dependency conflicts.
flask-appbuilder 4.4.1 requires Flask<3.0.0,>=2, but you have flask 3.0.2 which is incompatible.

Steps to reproduce

pip install -U flask
pip install flask-appbuilder

If I'm missing something, please let me know.