Changelog:
============
-Remove previously deprecated code.
-Deprecate the __version__ attribute. Use feature detection,
or importlib.metadata.version("flask"), instead.
-Restructure the code such that the Flask (app) and Blueprint classes have
Sans-IO bases.
-Allow self as an argument to url_for.
-Require Werkzeug >= 3.0.0.
Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
