Installation failing with Python 3.14

[jamesbraza]

Seen today with untokenize==0.1.1 when pip install was getting the requirements to build a wheel:

            File "/private/var/folders/5c/20jqnfqx4sv1_6_bdkf765cr0000gn/T/pip-build-env-ps0mz24x/overlay/lib/python3.14/site-packages/setuptools/build_meta.py", line 512, in run_setup
              super().run_setup(setup_script=setup_script)
              ~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^
            File "/private/var/folders/5c/20jqnfqx4sv1_6_bdkf765cr0000gn/T/pip-build-env-ps0mz24x/overlay/lib/python3.14/site-packages/setuptools/build_meta.py", line 317, in run_setup
              exec(code, locals())
              ~~~~^^^^^^^^^^^^^^^^
            File "<string>", line 19, in <module>
            File "<string>", line 14, in version
          AttributeError: 'Constant' object has no attribute 's'
          [end of output]

I believe this is related to python/cpython#90953.

I suggest this package move to pyproject.toml as #3 requests, it will eliminate this problem.

[NMertsch]

Related PR: #5