Add license to package classiers #535

Job	Run time
Python 3.7 on macos-13	2m 40s
Linux docs	1m 18s
Python 3.13-dev on macos-13	3m 30s
Python 3.7 on Windows x86	2m 33s
Linux meta	1m 4s
Python 3.13-dev (minimal build) on macos-13	3m 44s
Python 3.8 on Windows x86	1m 54s
Linux mypy	1m 0s
Python 3.13-dev on macos-latest	1m 52s
Python 3.9 on Windows x86	2m 52s
Linux pypy3	2m 57s
Python 3.13-dev (minimal build) on macos-latest	1m 25s
Python 3.10 on Windows x86	2m 52s
Linux pypy3	2m 40s
Python 3.11 on Windows x86	2m 44s
Linux py37	1m 49s
Python 3.12 on Windows x86	2m 44s
Linux py38	1m 21s
Python 3.13-dev on Windows x86	2m 56s
Linux py39	1m 20s
Python 3.7 on Windows x64	1m 46s
Linux py310	1m 45s
Python 3.8 on Windows x64	2m 12s
Linux py311	1m 23s
Python 3.9 on Windows x64	2m 12s
Linux py312	1m 48s
Python 3.10 on Windows x64	2m 13s
Linux py313	1m 54s
Python 3.11 on Windows x64	2m 13s
Linux py313 system	2m 29s
Python 3.12 on Windows x64	2m 14s
Linux py313 minimal	2m 44s
Python 3.13-dev on Windows x64	2m 51s
	1h 12m 59s

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