License problem with 16 when installing on Databricks

[dwsmith1983]

PEP 621 violation causes issues with installing databricks.

Signed-off-by: Dustin Smith dustin.william.smith@gmail.com

Fixes #1010

[kbattocchi]

PEP 621 has been superseded by PEP 639 and is now deprecated - see https://packaging.python.org/en/latest/specifications/pyproject-toml/#license and https://packaging.python.org/en/latest/guides/writing-pyproject-toml/#license-and-license-files, so we definitely do not want to make this change.

This is not a problem when using a recent version of setuptools. I think just updating setuptools (via pip install -U setuptools if you're in an environment managed by pip) should fix any issues; perhaps we could change line 69 to "setuptools>77.03" to force a more recent version but reverting to the deprecated license scheme doesn't make sense.

[dwsmith1983]

@kbattocchi please test your suggestion on Databricks. We cannot override pre-installed packages even if we upgrade it. This is on DBR 17

Installing collected packages: setuptools
  Attempting uninstall: setuptools
    Found existing installation: setuptools 74.0.0
    Not uninstalling setuptools at /usr/local/lib/python3.12/dist-packages, outside environment /local_disk0/.ephemeral_nfs/envs/pythonEnv-07bbc370-afd6-4f28-8e32-234ba964c593
    Can't uninstall 'setuptools'. No files were found to uninstall.
Successfully installed setuptools-80.9.0

Now install econml:

  Downloading econml-0.16.0.tar.gz (1.7 MB)
     ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 0.0/1.7 MB ? eta -:--:--
     ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 1.7/1.7 MB 48.5 MB/s eta 0:00:00
  Installing build dependencies: started
  Installing build dependencies: finished with status 'done'
  Getting requirements to build wheel: started
  Getting requirements to build wheel: finished with status 'error'
  error: subprocess-exited-with-error
  
  × Getting requirements to build wheel did not run successfully.
  │ exit code: 1
  ╰─> [95 lines of output]
      configuration error: `project.license` must be valid exactly by one definition (2 matches found):
      
          - keys:
              'file': {type: string}
            required: ['file']
          - keys:
              'text': {type: string}
            required: ['text']
      
      DESCRIPTION:
          `Project license <[https://peps.python.org/pep-0621/#license>`_](https://peps.python.org/pep-0621/#license%3E%60_).
      
      GIVEN VALUE:
          "MIT"