duffy errors when installed with pip

[carlosrodfern]

Steps to Reproduce:

python3 -m venv venv
. ./venv/bin/activate
python3 -m pip install duffy
duffy -help
/home/user/Dev/centos-stream/venv/lib64/python3.11/site-packages/pydantic/_internal/_config.py:257: UserWarning: Valid config keys have changed in V2:
* 'orm_mode' has been renamed to 'from_attributes'
  warnings.warn(message, UserWarning)
Traceback (most recent call last):
  File "/home/user/Dev/centos-stream/venv/bin/duffy", line 5, in <module>
    from duffy.cli import cli
  File "/home/user/Dev/centos-stream/venv/lib64/python3.11/site-packages/duffy/cli.py", line 34, in <module>
    from .configuration import config, read_configuration
  File "/home/user/Dev/centos-stream/venv/lib64/python3.11/site-packages/duffy/configuration/__init__.py", line 1, in <module>
    from .main import config, config_get, read_configuration  # noqa: F401
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/user/Dev/centos-stream/venv/lib64/python3.11/site-packages/duffy/configuration/main.py", line 10, in <module>
    from .validation import ConfigModel
  File "/home/user/Dev/centos-stream/venv/lib64/python3.11/site-packages/duffy/configuration/validation.py", line 7, in <module>
    from pydantic import (
  File "/home/user/Dev/centos-stream/venv/lib64/python3.11/site-packages/pydantic/__init__.py", line 206, in __getattr__
    return _getattr_migration(attr_name)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/user/Dev/centos-stream/venv/lib64/python3.11/site-packages/pydantic/_migration.py", line 285, in wrapper
    raise PydanticImportError(f'`{import_path}` has been removed in V2.')
pydantic.errors.PydanticImportError: `pydantic:stricturl` has been removed in V2.

For further information visit https://errors.pydantic.dev/2.0/u/import-error

The issue is that duffy doesn't really work with pydantic 2.0+, and the specification of dependencies within the wheel says that it can work with any pydantic version greater than 1.6.2.

If I force pydantic to a version lower than 2, it works.

[carlosrodfern]

I had a similar error with a PR check on another CentOS project that was installing duffy with pip.
We solved it by fixing the pydantic package version to 1.10.10: CentOS/sig-core-t_functional@c23397a

[carlosrodfern]

It needs an update in the pyproject.toml (see PR #865). The poetry.lock doesn't appear to need an update since it is pinpointing pydantic to a version <2.