MNT: drop deprecated License classifier, update related metadata (PEP 639) #281

Job	Run time
tests / Load tox environments	11s
tests / py39-test-pytest53 (ubuntu-latest)	46s
tests / py39-test-pytest61 (windows-latest)	1m 19s
tests / py39-test-pytestoldest (windows-latest)	1m 23s
tests / py310-test-pytest62 (ubuntu-latest)	47s
tests / py310-test-pytest70 (macos-latest)	59s
tests / codestyle (ubuntu-latest)	20s
tests / py310-test-pytest71 (windows-latest)	1m 16s
tests / py311-test-pytest73 (macos-latest)	41s
tests / py311-test-pytest72 (ubuntu-latest)	40s
tests / py312-test-pytest74 (windows-latest)	1m 28s
tests / py313-test-devdeps (ubuntu-latest)	1m 41s
tests / py313-test-pytest90 (ubuntu-latest)	42s
tests / py313-test-pytest83 (ubuntu-latest)	52s
tests / py39-test-pytest60 (macos-latest)	1m 30s
publish / Build source and wheel distribution	1m 15s
	15m 50s

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