pep639: setuptools license and license-files fields (#337) #499

Job	Run time
Build sdist	11s
build macos-latest (arm64) wheels	1m 2s
build windows-latest (AMD64) wheels	3m 4s
build ubuntu-latest (x86_64) wheels	1m 14s
build macos-latest (x86_64) wheels	59s
Publish to PyPI	0s
Show artifacts	0s
Publish to Test PyPI	0s
	6m 30s

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