[RFE] Refactor / Test for Flask 3.0

[sadsfae]

Flask 2.3.x is the latest stable release series for Flask, this RFE would cover any refactoring and testing we'd need to get it integrated into QUADS 2 (we're currently on 2.2.5)

https://flask.palletsprojects.com/en/2.3.x/changes/

Flask 3.0 or greater is now the default python3-flask major version for at least Fedora 40 and onwards, while we're still running Flask 2.2.5. There are breaking changes between 2.2.5 -> 3.0 (introduced in 2.3) and we'll need to refactor and test.

https://flask.palletsprojects.com/en/3.0.x/changes/#version-3-0-3

[sadsfae]

@grafuls @kambiz-aghaiepour bumping priority on this, Fedora 40 has already upgraded their system python3-flask package all the way to 3.0.3:

https://fedora.mirrorservice.org/fedora/linux/updates/40/Everything/x86_64/Packages/p/python3-flask-3.0.3-4.fc40.noarch.rpm

This means that Fedora 40 QUADS users will have issues until this is refactored.

[sadsfae]

Looks like most of what might break is just what's under the Remove previously deprecated code section here: https://flask.palletsprojects.com/en/3.0.x/changes/#version-2-3-0

From 2.3 -> 3.0 this is what was removed:

pallets/flask#5223

[sadsfae]

Closing this as it's completed.