Chore: Use SPDX. Update verlib2.

[amotl]

Just maintenance.

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch spdx-verlib2

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[amotl]

I think setup.py can be removed soon?

[seut]

Isn't this more related to https://peps.python.org/pep-0639/? Afaik we used SPDX expressions even before. I'd suggest to update the commit message to reflect this.

[seut]

According to https://packaging.python.org/en/latest/guides/licensing-examples-and-user-scenarios/ there is no need to explicitly define license_files or license_file?

Suggested change

license_files = ["LICENSE"]