CKAN 2.9.5 and next 2.10.0 will be running under Flask 2.0.3.

Migration to Flask 2.2.2 will have some work that we would address once 2.10.0 is released. Some of the key points to be able to run the latest version:

• We will need to update from Flask-Login 0.6.1 to 0.6.2 (See Upgrade requirements September 2022 #7064 description)
• We will need to fix/patch/replace flask-multistatic since it will not work with latest Werkzeug. It looks like the package it's not being maintained in a while, since it only and last release was 6 years ago: https://pypi.org/project/flask-multistatic/#history
• Fixing all tests ~122 failing tests when quickly fixing flask-multistatic locally.
• We still can't update Flask-Babel to 2.0.0 as it breaks ITranslation (see Flask-Babel 2.0.0 breaks ITranslation #6708 and
  Add support for multiple domains python-babel/flask-babel#194 cc @TkTech ) -> PR [#6708] Upgrade Flask-babel #7436
• dev-requirements.txt: docutils pinnned at 0.17 because sphinx-rtd-theme doesn't support a bigger version
• dev-requirements.txt: pytest-factoryboy pinnned at 2.4.0 because on 2.5.0 we get: