Please update the requirements.txt in examples/sqla/

[Soham7777777]

Hello, I am Soham from Darshan University in India, Gujarat, Rajkot. I am fond of creating web apps in Python, especially in Flask. When I heard about this extension from a Stack Overflow question, I was really amazed, so I decided to give it a try and follow the README file for this project.

In the main README file, there are steps to run an example server. One of these steps is to install modules from examples/sqla/requirements.txt. The problem is that there are no versions specified in that text file (maybe it's handwritten and not using the pip freeze command). Thus, the installed Flask version is modern, and the installed Babel version is old (because there is "Ex" attached to the name). When running the server from run_server.py, it gives this error:

Traceback (most recent call last):
  File "/home/soham/Desktop/random_experiments/flask-admin/examples/sqla/run_server.py", line 1, in <module>
    from admin import app
  File "/home/soham/Desktop/random_experiments/flask-admin/examples/sqla/admin/__init__.py", line 3, in <module>
    from flask_babelex import Babel
  File "/home/soham/Desktop/random_experiments/flask-admin/pyenv/lib/python3.11/site-packages/flask_babelex/__init__.py", line 20, in <module>
    from flask import _request_ctx_stack
ImportError: cannot import name '_request_ctx_stack' from 'flask' (/home/soham/Desktop/random_experiments/flask-admin/pyenv/lib/python3.11/site-packages/flask/__init__.py)

(This is my first issue by the way...)

[npadgen]

Seems to be the same as issue #2413