Pint should define a min version for typing_extensions

[beenje]

We found an issue with pint 0.22 due to an old version of typing_extensions installed.

____________________ ERROR collecting cli/test/test_alt.py _____________________
ImportError while importing test module '/usr/local/lib/python3.9/dist-packages/taurus/cli/test/test_alt.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
/usr/lib/python3.9/importlib/__init__.py:127: in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
/usr/local/lib/python3.9/dist-packages/taurus/cli/test/test_alt.py:25: in <module>
    from taurus.core.util.test.test_plugin import mock_entry_point
/usr/local/lib/python3.9/dist-packages/taurus/core/__init__.py:87: in <module>
    from .taurusattribute import *  # noqa: F403,F401
/usr/local/lib/python3.9/dist-packages/taurus/core/taurusattribute.py:39: in <module>
    from taurus.core.units import Quantity
/usr/local/lib/python3.9/dist-packages/taurus/core/units.py:34: in <module>
    from pint import UnitRegistry, __version__
/usr/local/lib/python3.9/dist-packages/pint/__init__.py:28: in <module>
    from .formatting import formatter, register_unit_format
/usr/local/lib/python3.9/dist-packages/pint/formatting.py:20: in <module>
    from .babel_names import _babel_lengths, _babel_units
/usr/local/lib/python3.9/dist-packages/pint/babel_names.py:11: in <module>
    from .compat import HAS_BABEL
/usr/local/lib/python3.9/dist-packages/pint/compat.py:34: in <module>
    from typing_extensions import Self  # noqa
E   ImportError: cannot import name 'Self' from 'typing_extensions' (/usr/lib/python3/dist-packages/typing_extensions.py)

typing_extensions 3.7.4 is installed but typing_extensions.Self was only added in 4.0.0

pint should require at least typing_extensions >= 4.0.0. Not sure if even a newer version is needed or not.

[dcamron]

Hit this on a recent MetPy stackoverflow question and successfully recreated with

pint                      0.22
python                    3.10.13
typing_extensions         3.10.0.2