Fix deprecations in pyproject.toml

[larsevj]

Deprecation fixups for setuptools and setuptools_scm.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.45%. Comparing base (4f7ba79) to head (645d743).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #843   +/-   ##
=======================================
  Coverage   83.45%   83.45%           
=======================================
  Files          49       49           
  Lines        7283     7283           
=======================================
  Hits         6078     6078           
  Misses       1205     1205           

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[Copilot]

Pull request overview

This PR addresses deprecation warnings in setuptools and setuptools_scm configuration. Despite the title mentioning autoapi/sphinx-autoapi, the actual changes focus on modernizing the project metadata configuration in pyproject.toml.

Key changes:

• Updates setuptools_scm configuration to use the newer version_file field instead of deprecated write_to
• Migrates license specification to SPDX identifier format with explicit license-files declaration

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