Default project no longer working due to version incompatibilities

[blakesims]

Hi there,
I was running this demo project, following the instructions carefully, but I kept getting an internal error before authentication: 'Flask' object has no attribute 'session_cookie_name'

I believe this is due to a version incompatibility between Flask and Flask-Session.
I changed the requirements.txt to:

werkzeug==2.0.3
flask==2.0.3
flask-session==0.4.0
flask-oauthlib==0.9.6
xero-python==6.1.0

and now it seems to be working

Happy to make a PR if helpful.

[github-actions]

PETOSS-677

[github-actions]

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