Flask 2.1.2 broken under Python 3.14

[crkoehnen]

Updating dependencies as Flask 2.1.2 used pkgutil.get_loader, which was removed in Python 3.14.

These dependencies also work with Python 3.13.7. I haven't tested further back.

~/code/contact-app: python ./app.py 
Traceback (most recent call last):
  File "/home/crk/code/contact-app/./app.py", line 13, in <module>
    app = Flask(__name__)
  File "/home/crk/.pyenv/versions/3.14.3/lib/python3.14/site-packages/flask/app.py", line 406, in __init__
    instance_path = self.auto_find_instance_path()
  File "/home/crk/.pyenv/versions/3.14.3/lib/python3.14/site-packages/flask/app.py", line 638, in auto_find_instance_path
    prefix, package_path = find_package(self.import_name)
                           ~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^
  File "/home/crk/.pyenv/versions/3.14.3/lib/python3.14/site-packages/flask/scaffold.py", line 844, in find_package
    package_path = _find_package_path(root_mod_name)
  File "/home/crk/.pyenv/versions/3.14.3/lib/python3.14/site-packages/flask/scaffold.py", line 804, in _find_package_path
    loader = pkgutil.get_loader(root_mod_name)
             ^^^^^^^^^^^^^^^^^^
AttributeError: module 'pkgutil' has no attribute 'get_loader'