BLD: avoid a deprecation warning from setuptools (PEP 639 license metadata) #253

Job	Run time
Build macos-13 (x86_64) wheels	6m 22s
Build ubuntu-22.04 (aarch64) wheels	27m 9s
Build wheels for win_amd64 on windows-latest	11m 1s
Build source distribution	38s
Build macos-14 (arm64) wheels	2m 21s
Build ubuntu-22.04 (x86_64) wheels	3m 5s
Show artifacts	9s
Publish to PyPI	0s
	50m 45s

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